Adding Roses to Your Garden

Posted on January 6, 2018 by tomkarwin

Rose season is upon us! New plants have arrived at most garden centers, and this is the right time to decide if your garden would benefit from the addition of a rose.

The array of available varieties can be overwhelming, so preparation can streamline the selection process and increase your post-purchase comfort.

As you assess your landscape’s need for a rose, decide whether you want a shrub, climbing, rambling, miniature, or standard (tree) rose. This choice could narrow your search dramatically, but if you focus on a shrub rose, you will find the largest number of choices.

Another classification system identifies wild roses, old garden roses, and modern garden roses. The online resource Wikipedia provides a very welcoming and orderly overview of the seemingly countless kinds of roses.

Hybrid tea roses are among the most popular kinds of the modern garden roses. Hybrid teas, which are widely available in garden centers, provide gorgeous blossoms in a wide and growing range of forms and colors and almost always a beguiling fragrance. Selection relies upon the individual gardener’s priorities, which might involve complementing the colors of the garden’s existing collection of roses.

Local Master Rosarian Joe Truskot particularly appreciates the hybrid tea rose ‘Maria Callas’, which is also sold as “Miss All-American Beauty.’ Truskot is the author and publisher of the Central Coast Rose Manual, a valuable and unique resource for growing roses in the Monterey Bay area. This book can be found at Alladin Nursery (Watsonville), Bokay Nursery (Salinas), River House Books (Carmel), and Bookshop Santa Cruz (Santa Cruz).

The adventuresome gardener might wish to explore the extensive world of species roses, which are plants that occur in nature, without help from humans. Depending on who is counting there are 100 species or more than 360 species. These are the true wildflowers of the rose genus, always with five petals in white, pink or red blossoms. They occur in diverse scents, foliage, hips, and autumn colors. They are valued in naturalistic planting schemes and for the minimal pruning requirements. They bloom on new wood, so they can be cut back after flowering.

The species rose most likely found in a garden center is Rosa rugosa, also known as the Japanese Rose. (“rugosa” means “wrinkled,” referring to the plant’s corrugated leaves). Rosa rugosas are also available in various cultivars and hybridized with other species.

My garden includes two species roses:

Rosa californica is a fine addition in several ways to my native California bed, but it tends to spread through underground runners and develop a thicket.

Rosa mulligani, a rambler that grows vigorously and produces twenty-foot branches and spectacular one-time summer displays of white flowers.

Rosa Mulligani

To explore the world of roses, visit these websites:

Roses of Yesterday and Today

The months of January and February are the best time to prune roses, according to Joe Truskot. Now is a good time to refresh your knowledge of this annual task, inventory your roses, sharpen your tools, and schedule your pruning session. You might also attend Monterey Bay Rose Society’s hands-on Pruning Clinic at the Santa Cruz County Fairgrounds, 10:00 to 12:00 on January 13^th and 14^th, 2018. Local rose experts will volunteer their practical experience with best practices in this process, which can add significantly to bloom production during the coming season.

Spiny Plants in the Garden

Posted on January 6, 2018 by tomkarwin

Some attractive succulent plants can be dangerous!

Agaves, in particular, are often armed with spines that challenge both creatures that threaten to eat the plant and gardeners with the best of intentions.

A popular hybrid Agave ‘Blue Glow’

The spines of many agaves generally occur as wickedly sharp points at the ends of leaves. These are called terminal spines, or more technically spinose apical processes. Spines that occur on the edges of leaves are marginal spines or spinose teeth.

By either name, they amount to the plant’s formidable defenses as well as to its aesthetic qualities.

Other spinose structures on plants include thorns and prickles. Here’s a primer for keeping them straight:

Spines are modified leaves or parts of leaves and are found on most cacti and some succulents.
Thorns are modified branches or stems and are found on some trees (citrus, hawthorn, honey locust, natal plum, etc.) and shrubs (pyracantha or“firethorn”, bougainvillea, Silverthorn, etc.)
Prickles are derived from the epidermis, which is the single layer of cells that covers the leaves, flowers, roots, and stems of plants. An informal definition of a prickle is “any pointed, sharp plant part that isn’t where a branch or leaf would be.” The rose provides the most similar example of prickles, which are often incorrectly called thorns of the rose. Other examples are the pink silk floss tree (Ceiba speciosa) and the less common white silk floss tree (Ceiba insignis).

Gardeners who practice the Chinese art of feng shui probably should avoid spiny plants entirely, especially near the entrance to the home. These plants are thought to stop the flow of chi, the central life force.

Still, many gardeners regard agaves as attractive, despite or because of the spines that many agaves develop. There are a few strategies that allow gardeners to cultivate spinose agaves or cacti without becoming harmed.

Some gardeners will snip the plant’s terminal spines. This approach might be appropriate for plants that are very near walkways or readily accessible to small children, but gardeners so concerned about spiny plants should avoid them in favor of softer varieties.

The most basic defense strategy involves simply being careful and alert to the potential harm.

Some uncommon gripping and cutting tools can be helpful in removing dead leaves or weeding around such plants. One online source is http://cactuspruner.com. Amazon also offers German-made 17.7-inch cactus tweezers that are angled for convenient use.

When planting or transplanting dangerous plants, leather gauntlet gloves and a long-sleeved sturdy shirt provide good protection.

An inexpensive and functional tool for such tasks is a bath towel, which can be used to wrap the plant for safe lifting and transport.

For an interesting brief video on using a winch to transplant a large cactus safely, browse to youtube.com and search for “Repotting a Giant Golden Barrel Cactus.”

With preparation and appropriate tools, gardeners can handle spiny agave plants without acquiring scratches or puncture wounds, and with the enjoyment of their dramatic beauty and a great variety of colors and forms.

Gifting Garden Books

Posted on January 6, 2018 by tomkarwin

As we enter the season of giving, you might puzzle over finding gifts for gardening friends, or for that matter advising well-intentioned but stumped gift-givers what you might enjoy finding under your holiday evergreen.

Gardeners can always use another special plant or a great tool that works without a cord or spark plug, but a gardening book can be an excellent choice.

In selecting a gardening book as a gift, first considerations include quality of content and the recipient’s interests.

Gardeners I have met are typically fascinated by what other gardeners have done with their patch of soil, so books about —and tours of—other people’s gardens are perennial favorites. A new addition to this popular genre is Private Gardens of the Bay Area, by Susan Lowry and Nancy Berner, with photographs by Marion Brenner (The Monacelli Press, 2017).

The book’s title, of course, refers to gardens around the San Francisco Bay. There are many “bay areas,” but SF somehow has assumed ownership of that term. That’s not objectionable in this case because the Monterey Bay and San Francisco Bay areas have similar growing conditions. (Gardeners in the Chesapeake Bay area might feel differently.)

This book resonates with local gardening priorities because of its consistent and light-handed interest in sustainability, especially through lawn alternatives and drought-tolerant plants. The garden presentations convey these important messages subtly through multiple examples and without preaching.

The book takes the reader on an imaginary tour of thirty-nine gardens, which the book groups in four regions surrounding SF Bay. The gardens range in size from very small to very large, the gardeners range from dedicated amateurs to experienced designers, and the product compiles a wealth of ideas to inspire all gardeners.

The garden descriptions, averaging about six pages, understandably focus on each site’s exceptional vignettes, which are the most readily adaptable features for one’s own garden. Time is needed to add impressive mature plants to the garden but effective designs can be replicated with creativity and commitment.

Authors Lowry and Berner have written other books on private gardens; their communication skills are evident in each garden description. They introduce the gardeners, provide a bit of the garden’s history, characterize its design successes, and often highlight individual plants that contribute to the garden’s uniqueness. Their prose is non-technical and readable, and they also include botanical names of plants for those who wish to search for more information.

Marion Brenner’s photographs are beautifully done. Most of her images present aspects of the landscapes of interest while some show satisfying details of specific plants. The authors also credit Brenner as their guide to SF Bay Area gardens, drawing on her decades of experience in local garden photography.

Private Gardens of the Bay Area would be a fine gift to an avid gardener living in this part of California, or to others who would like to experience this horticultural paradise vicariously.

Happily, you can also choose from many excellent gardening books on a wide range of topics, assuming you what inspires your giftee’s gardening pursuits. The American Horticultural Society annually recognizes exceptional gardening literature through the AHS Book Awards. The winners for 2017 include the following:

All the President’s Gardens by Marla McDowell (Timber Press) —the White House gardens;
The Bee-Friendly Garden, by Kate Frey and Gretchen LeBuhn (Ten Speed Press) —plants for bees;
Garden Revolution, by Larry Weaner and Thomas Christopher (Timber Press) —ecological gardening;
Plant, by the editors at Phaidon Press (Phaidon Press) — fascinating botanical art; and
Rock Gardening, by Joseph Tychonievich (Timber Press) — photos and detailed info on this gardening style.

For more info, browse to the AHS Book Awards for 2017 and then click in turn through Gardening Programs, National Awards, and Book Awards. There are outstanding books for many gardening specialties, easing your efforts to cultivate just the right gift.

You have another opportunity to find selected gardening books as well as plants and other gifts at Norrie’s Gift & Garden Shop at the UCSC Arboretum. Norrie’s Holiday Open House will be open from 10:00 to 4:00 tomorrow, December 2^nd.

Identify Your Mystery Plants

Posted on November 25, 2017 by tomkarwin

When adding a plant to your garden, best practice includes knowing about the plant’s growing needs and mature size. Retail sources of plants should and usually do provide such basic facts on a label or catalog entry. The gardener could make do with that information or could dig a little deeper in a reference book like Sunset’s Western Garden Book, or through the growing riches of online resources

To learn more about a given plant, begin with the botanical name, which is the plant’s unique identifier. Common names might be helpful in finding a plant’s botanical name: some garden books will cross-reference common and botanical names, and a web search for a common name might turn up the botanical name. Another strategy, especially when acquiring a plant from another gardener, is to ask the donor or members of a local garden society that specializes in the plant of interest. The most dedicated gardeners often will come up with the correct name, but for those who will only hazard a guess, check the name with a reliable source.

On occasion when an unfamiliar plant lacks a name, there’s no one to ask, and your curiosity reigns, the Internet will save the day.

The Internet offers various online plant identification resources, but they are mostly automated operations and not very accurate. To be less than polite, some are outrageously bad and a waste of time.

One online plant identifier that works quite well and with impressive speed is the National Gardening Association’s Plant ID Forum. Its accuracy and efficiency are derived from the participation of actual living gardeners, rather than the current generation of computers. (A future machine might outperform all horticulturists in plant ID tasks, but it’s not here yet.)

I frequently need the name of unlabeled plants that I see in a private or public garden, or that I acquire at a garden exchange. A recent column (ongardening.com/?p=2925) included a photo of a mystery plant seen at a garden tour.

Firecracker Plant

The Plant ID Forum quickly identified it as a Firecracker Plant (Russelia equisetiformis ), an impressive Mexican shrub with a specific name that compares it to the horsetail rush. My next step is to find a source for this plant.

At a local garden exchange, I acquired two small plants that were mysteries to me, so I sent photos to the Plant ID Forum.

Creeping Fucshia

I soon learned that one is a Creeping Fuchsia (Fuchsia procumbens) that is a New Zealand native, thought to be the world’s smallest fuchsia, and categorized as an endangered species due to habitat loss. Quite a discovery!

Coin Leaf Peperomia

My other mystery plant from the garden exchange is a Coin Leaf Peperomia or Baby Rubber Plant (Peperomia polybotrya ‘Variegata’), which is native to the Andes Mountains of Peru. I learned that it’s primarily for its foliage, and thrives as a houseplant in indirect light.

Your plants need not be mysteries! Sign up for the Plant ID Forum, a free service of the National Gardening Association. Once you have established this connection, explore the website’s several forums and other features. If you have gardening questions other than finding the name of a mystery plant, try the Ask a Question Forum, which is a fairly new feature of this site. It welcomes the full range of inquiries, from “there are no stupid questions” to “stump the experts.” It can be quite useful in broadening your gardening knowledge

Marijuana Comes Out of the Haze

Posted on November 25, 2017 by tomkarwin

Recent projections of the retail cost of marijuana are encouraging for aspiring cannabis gardeners.

The short story: the cumulative costs of state and local taxes and fees will make recreational marijuana quite expensive: a single roll-your-own marijuana joint could cost $10.

Observers expect that these costs could burden legal providers of marijuana and encourage their black market competitors.

As that drama plays out, these costs also could greatly increase the cost-effectiveness of personal cultivation of cannabis.

Cannabis Leaf

This image is from Robert Bergman’s online publication: “Growing Marijuana in California” (http://www.ilovegrowingmarijuana.com/growing-marijuana-california/

Background

A year ago, California voters enacted Proposition 64, the Control Regulation and Tax Adult Use of Marijuana Act (the “AUMA”). Along with its other purposes, this proposition authorized personal cultivation of nonmedical (i.e., recreational) cannabis by persons 21 years of age or older, subject to locally adopted regulations.

The County of Santa Cruz has adopted such regulations; they took effect on May 31, 2017. Reportedly, Santa Cruz County was California’s first county to take this action. The County of Monterey anticipates adopting regulations for adult use/recreational cannabis businesses “in the near future” (probably by January 1, 2018).

Personal Cultivation

When California voters approved the AUMA, many people considered trying this previously forbidden recreation. For the record, this column neither recommends nor discourages recreational use of marijuana. That is a personal decision.

A good number of people were—and continue to be—decidedly not interested in marijuana. Still, some other people are interested in growing up to six marijuana plants, which is the maximum number allowed for personal grows. Avid gardeners might have a particular interest in cultivating this unfamiliar new plant, whether or not they wish to explore its psychoactive properties.

Growing your own cannabis and making your own marijuana cigarettes might be compared to growing your own grapes and making your own wine. In both examples, the hobbyist compares the enjoyment of the hobby’s time and cost with the time and cost of simply buying the commercial product.

The projected retail cost of marijuana adds significantly to the appeal of personal cultivation. This column is for gardeners who are interested in exploring that hobby.

When the AUMA was approved, we outlined the stages of cannabis cultivation: sprouting, vegetative growth, flowering, harvesting, and drying & curing. We also provided links to free online resources that offer more detailed information. To review that column, go to http://ongardening.com/?p=2641.

Cannabis information sources are evolving rapidly, so for up-to-date rates, growing advice, etc., search the Internet for “cannabis seeds” and “cannabis cultivation.”

Local Regulations

Also important: adherence to state and local regulations. Santa Cruz County residents should read the local regulations. For easy access, here is a link to “Santa Cruz County Code Chapter 7.134.” Monterey County residents should watch and wait for the adoption of their own county’s regulations.

All parts of these regulations are important, but prospective cannabis growers will need a way to meet the requirement to conduct all stages of cultivation on their own residence grounds inside a locked and secured structure such as a shed or greenhouse, and not visible from a public place. Cannabis can, but may not be, grown outdoors.

Next Steps

The cost of growing cannabis begins with the seeds, which are available from mail-order sources for $10 to $15 per seed, depending on the strain. Choosing which seed to buy and plant involves research or an arbitrary decision. Planting should be scheduled for early spring, so there is time to order seeds, select or create a legal structure for cultivation, and gain at least basic familiarity with the process. Because this plant has the common name “weed,” growing it will not be difficult for capable gardeners. However, as with all plants, very good cultivation produces very good results, so growing cannabis well could challenge even experienced gardeners.

Daisy Tree for Dramatic Effect

Posted on November 25, 2017 by tomkarwin

My Daisy Tree is a doozy!

I first encountered this striking plant during a visit, several years ago, to the Esalen Institute. A gardener at the Institute told me its name, and later I found a small specimen to add to my garden.

This is Montanoa grandiflora, a native of southern Mexico (around Mexico City) and some other Central American countries. The plant was named for Luis Jose Montana (1755-1820), a physician, politician and amateur botanist. The specific epithet “grandiflora” is often applied to certain roses, but it just means “large flowers” and is applied to some other plants as well. For this plant, a different rose term, “multiflora” (many small blooms) would be more accurate.

The Daisy Tree is a member of the Sunflower tribe (Heliantheae) of the enormous Aster family (Asteraceae), and a relative to several familiar garden flowers: Coreopsis, Cosmos, Echinacea, Rudbeckia, and Zinnia, as well as the commercially important sunflower and Jerusalem artichoke. The Montanoa genus includes thirty-five species. Surprisingly, none of these are listed in Sunset’s Western Garden Book.

This plant grows well in full sun in the Monterey Bay area’s climate and is winter-hardy down to the mid-20s (which do not concern local gardeners).

Daisy Tree
Montanoa grandiflora

The Daisy Tree’s uniqueness comes first from its size. It grows up to twelve feet high and twelve feet wide (mine is about ten by ten). Its second feature is its floriferous nature. Some reports indicate that its flowers can be so abundant as to conceal the foliage, but I can still see my plant’s large lobed leaves. It’s possible that a little irrigation and fertilizer would increase the floral yield; my plant has grown on its own, without my assistance.

Daisy Tree Blossoms

The flowers are unremarkable individually, but they appear in late October or early November and could last into early December. They create a fine display and provide a pleasantly sweet fragrance that suggests chocolate or vanilla. Some sniffers have found the fragrance resembles that of freshly baked cupcakes, so the blossoms might recall one’s own olfactory memories.

After the blossoms fade, attractive chartreuse seed heads last through the winter.

In early spring, horticulturists recommend cutting a Montanoa grandiflora hard to allow the development of new sprouts from the base.

This might seem like drastic action for such a large shrub, but that treatment has worked fine for another large Mexican native in my garden, the Tree Dahlia (Dahlia imperialis). My garden includes a stand of Tree Dahlias. I cut them to the ground last spring and they have now reached about thirty feet high and are about the begin blooming (a little later than the Tree Daisy.

Tree Dahlia (Dahlia imperialis)

Tree Dahlia Blossom

The stunning annual growth cycle of these larger plants demonstrates their vigor, and their presence in the garden provides wonder and beauty. The bees enjoy them as well!

The Tree Daisy and Tree Dahlia are not commonly available in garden centers, in my experience, but both are available as small plants via mail order from Annie’s Annuals.

Most gardens can accommodate a few really large plants. While appropriate placement is always important, they can provide a dramatic feature to the landscape.

Alternatives to Trendy Plants

Posted on November 5, 2017 by tomkarwin

When thinking about irises, gardeners—and all garden groupies—envision the tall bearded varieties. Decades of hybridizers have tweaked these plants to produce luscious colors, fascinating forms, great productivity and disease resistance. They are excellent plants that are easy to grow and great assets in the landscape.

The same can be said of roses and tulips, which include popular garden selections that have been hybridized through multiple generations to produce qualities that qualify them as “super plants.”

The hybridizers are creative, imaginative, and extraordinarily painstaking and patient as they build upon past successes and pursue horticultural perfection, the definition of which continues to evolve.

Home gardeners who enjoy these plants can be drawn into the endless process of acquiring the latest introductions featured in each season’s mail-order catalog photos. Each offers something a bit different and better than its predecessors.

For many gardeners, this process can be absorbing and defining of the essence of gardening.

Consider an adventuresome alternative: stepping off the bandwagon and exploring the vast array of related, less fashionable plants that can be equally beautiful with a more natural look, often relatively free of pests and diseases, and invariably less expensive.

Roses

When it comes to roses, look for the “own-root” selections. These are plants that are grown from cuttings and do have developed their own roots, rather than being grafted on a rootstock such as “Dr. Huey.” These are often historic varieties or stable hybrids. The advantages of own-root roses over grafted roses include greater cold-hardiness, shapelier (because they do not grow from a graft), and complete absence of rootstock suckers. Mail-order sources of own-root roses include Heirloom Roses, High County Gardens, David Austin and others.

Rosa ‘Mary Rose’ by David Austin Roses

Irises

Alternatives to the tall bearded hybrids include the beardless varieties. The America Iris Society identifies many species of breadless irises, organized in several series within subsections. For an excellent overview of beardless irises, search for Ben Hager’s article, “Beardless Iris,” on the Pacific Horticulture magazine website.

One series listed by the AIS, Series Californicae, may be of particular interest to readers of this column. Most of the species in this series are referred to collectively as Pacific Coast Irises (PCIs), because they are native to and grow well in coastal habitats, like the Monterey Bay area. Right now is the ideal time to plant PCIs.

Local hybridizer, Joe Ghio, has created many new PCI cultivars and won numerous national awards for his introductions. His catalog of both tall bearded irises and PCIs is available for $3 from Bay View Gardens, 1201 Bay St., Santa Cruz, CA 95060.

Tulips

The several groups of hybrid tulips include Darwins, Triumphs, Fosterianas, Gregeiis, Kaufmannias, Viridifloras, and others. These groups include many hundreds of cultivars that could overwhelm the most avid collector. All produce uniquely gorgeous blossoms, require a winter dormant period for reliable bloom, and attract gophers. Alternatives to these very popular plants, especially for areas without several weeks of cold weather, are called the species tulips. These are “the little bulbs that have given rise to all the big showy hybrids.” These smaller plants are native to areas around the Mediterranean Sea, the Caucasus Mountains, or Asia Minor, and grow fine in the Monterey Bay area.

Species tulips that are good selections for the Monterey Bay area’s moderate climate include Tulip sylvestris (Europe), T. bakeri “Lilac Wonder” (Crete), T. clusiana var. chrysantha and “Lady Jane” (Iraq, Iran, Afghanistan), and T. saxatilis (Crete).

Most mail-order sources of tulips, daffodils and other geophytes usually also offer species tulips. Look for them in the catalogs of McClure & Zimmerman, Van Engelen, Brett & Becky’s Bulbs, John Scheepers, and others.

Touring California’s Best Gardens

Posted on November 5, 2017 by tomkarwin

Gardeners should visit public gardens to broaden their knowledge of garden design and plants. Visiting private gardens is also a good practice, especially to learn about the possibilities on a residential parcel, with various levels of time and resources. By contrast, public gardens typically are much larger than private gardens and have much more gardening support, including staff and volunteers. They can be wonderful resources for the home gardener’s continuing education.

An excellent resource for visiting public gardens is Donald Olson’s new book, The California Garden Tour (Timber Press, 2017). The book’s subtitle, “The 50 best gardens to visit in the Golden State,” describes its scope, and the contents page lists these targets geographically. The book includes maps of the northern and southern parts of the state, showing garden locations.

The Northern California section lists twenty-six gardens, from the Mendocino Coast Botanical Gardens in the north and continuing southward to The Secret Gardens of Monterey.

The Southern California section lists twenty-four gardens, with the Santa Barbara Botanic Garden northernmost and San Diego’s Balboa Park southernmost.

Olson’s nineteen-page introduction is definitely worth reading. It includes a concise history of California gardens, a distinction between art gardens and botanical gardens, a nice overview of the California floristic province, and more.

Olson then describes each of the gardens in two or three pages, providing enough information to prepare the visitor with the garden’s history and orientation. The descriptions include a summary of basic facts: address, operating hours, phone number and web address, admission cost (usually free), etc.

His descriptions are readable and include one or more photographs by the author. Olson’s comments about the plant collections and noteworthy plants reveal his familiarity with horticulture and his appreciation for plants that each garden features.

Information about the books fifty gardens and other public gardens in California is available on the Internet: Google “California public gardens” for links to several websites that list such gardens, often with terse descriptions. Such information can be useful but doesn’t compare well with Olson’s more complete and expert presentation, like that of a well-informed friend. A visit to given garden’s website will yield more information of interest, but if you are interested in visiting any of California’s excellent public gardens, this book will be a valuable introduction.

Here are three recommendations for visiting a public garden.

Select a garden to visit firstly for its convenience. The maps in Olson’s book will be helpful in spotting gardens that are close to your home, or near a future travel route. Certainly, readers of this column you might begin with gardens of the Monterey Bay area: the UC Santa Cruz Arboretum and The Secret Gardens of Monterey.

As you enter a garden, notice how the pathways bring visitors past a series of horticultural displays. These displays might be designed as vignettes or “rooms,” or as sections that focus on plant genera, geographic regions or landscape styles. If the pathways offer only a random variety of routes to follow, look for a map that helps to make sense of the garden experience. Larger public gardens’ maps might highlight one or more walking routes as learning opportunities. A large garden that lacks an organizational model can be confusing and less successful, despite expert maintenance of the inventory of plants.

Finally, prepare to enjoy your visit. For some gardeners, preparation might include listing learning objectives, but for all visitors, it is wise to wear comfortable shoes and weather-appropriate attire, carry some water and provide enough time to enjoy the experience.

Federal and state agencies recognize public gardens as living museums. They offer unique resources for both avid gardeners and casual appreciators of nature to gain an understanding of our horticultural environment. California has many wonderful public gardens (even more than the fifty excellent gardens in Olson’s book) that should be part of every gardener’s ongoing education. Find time to see a new garden every year.

Designing a Succulent Garden

Posted on November 5, 2017 by tomkarwin

The recent surge of interest in gardening with succulent plants combines the appreciation of colorful plants with architectural interest, drought-tolerance, and ease of maintenance.

Succulent plants are often grouped in the landscape because they share a preference for limited irrigation. This approach, called “hydrozoning,” simplifies watering tasks, and, conversely, avoids accidentally over-watering succulents.

This emphasis on the design of irrigation plans often results in garden designs that consist entirely of succulent plants. This approach can produce interesting “desert landscapes” that compare and contrast the range of colors, forms, and textures of the plants. The plants might be spaced widely or clustered closely.

Examples of such landscapes can be viewed at these websites: https://tinyurl.com/y7kclnee and https://tinyurl.com/y8vhzje4.

Succulent plants, by definition, are native to places with limited moisture: sandy deserts, rocky mountainsides, and plains that have extended periods of drought and occasional downpours. A desert landscape design will be most successful aesthetically when the plants are in fact native to a similar dry environment. Two basic styles are the rock garden, simulating a mountainside, and a desert-like sandy or gravelly bed,

A second consideration in planning such a landscape is to focus on plants from the same geographic region. While succulent plants grow in many parts of the world, the specimens that are most commonly available from garden centers and mail-order sources are from either Mexico or South Africa, with Australia as a distant third.

In the Monterey Bay area, succulent plants from all of these areas will thrive, but mixing them in a garden design often yields a haphazard appearance. The arbitrariness of the combination will be obvious to gardeners who study succulents, and subtly “off” to casual observers.

Another basic approach to the succulent landscape design involves combining succulent plants with drought-tolerant perennials. Such combinations certainly occur in nature, so an authentic design that rings true intuitively requires some research. This approach can provide interesting contrasts between relatively static succulent plants and visually active plants, such as grasses.

A third approach involves deliberately showcasing plants from a variety of native habitats. The plants used in such a landscape still need to be appropriate to the growing environment, and might require selective irrigation from a well-planned drip irrigation system, but can be educational from a horticultural perspective. An accompanying annotated garden map would add value to such an essentially educational landscape.

If you are now or might become inspired to develop a small or large landscape devoted to succulent plants, decide on a thoughtful approach, do some preliminary research, and install the landscape that fulfills your unique vision. The result is most likely to satisfying to yourself and appealing to visitors to your garden.

Gardening for the Senses

Posted on November 5, 2017 by tomkarwin

Gardeners develop and maintain ornamental gardens primarily for the visual appeal of beautiful blossoms and lush foliage. These gardens also please the sense of sight with the shapes of plants and the similarities or contrasts between plants.

Ornamental plants could also please three other of our senses:

Taste is served by certain plants that are both edible and ornamental, e.g., Saffron (Crocus sativus);
Touch is valued in plants that interesting texture, e.g., Lambs Ears (Stachys byzantina); and
Hearing relates to plants that rustle in the breeze, e.g., New Zealand Flax (Phormium.

There are more examples of ornamental plants that appeal to these senses, but they are minor features of the garden, relative to plants that appeal to our sense of sight.

The fifth important category of ornamental plants is the aromatic plants: those that appeal to the gardener’s sense of smell.

The blossoms or the leaves, or both, of aromatic plants, produce volatile compounds that are known as essential oils. Their primary purpose, of course is to attract pollinators, but people have found myriad culinary, medicinal, therapeutic, and even magical and uses of such plants. Books have been written about such desirable applications. Here, we focus on our enjoyment of the aesthetic appeal of aromatic plants.

Plants with aromatic foliage release their essential oils primarily during the heat of the day. When the sun goes down, the foliage must be rubbed to appreciate the fragrance.

In comparison, some aromatic flowers release their perfumes during the evening and night hours to attract moths that have evolved to reach the plant’s nectar through long corolla tubes,

Many aromatic plants produce pleasant fragrances during the daytime and can be desirable additions to the landscape. An online search for “aromatic plants” will yield the information needed to select and locate plants to optimize daytime and evening enjoyment.

For example, very popular evening-scented aromatic plants include Sweet Rocket (Hesperis matronalis), Border Phlox (Phlox paniculata), Honeysuckle (Lonicera), Evening Primrose (Oenothera biennis), Night-scented Phlox (Zalusianskya ovata), and Night-scented Stock (Matthiola bicornis).

The aromatic California native plants may be particularly interesting to gardeners in the Monterey Bay area. We appreciate the studies of Jackie Pascoe, a member of the California Native Plant Society, to select a few noteworthy plants in this large group.

Spice Bush (Calicanthus occidentalis) – wine barrel scent
Vanilla Grass (Hierogonum occidentalis) – vanilla scent
Fragrant Pitcher Sage (Lepechinia fragrans) – minty, but entirely unique scent
Coyote Mint (Monardella villosa) – minty scent
Wild Mock Orange (Philadelphus lewisii) – orangey scent
Cleveland Sage (Salvia clevelandii) – clean scent, “like a sweet desert morning”
Yerba Buena (Satureja douglasii) – wonderfully spicy scent
Catalina Perfume (Ribes viburnifoium) – fine wine scent

You could find some of these aromatic plants at the California Native Plant Society’s sale on Saturday. For info, see the story elsewhere in today’s newspaper.

Another good opportunity to learn about aromatic plants is to visit the Aroma Garden at UCSC’s Arboretum & Botanic Garden.

Explore the large and varied universe of aromatic plants to discover your preferences, and add a few to selected locations in your garden to expand your sensual enjoyment.