Time to Plant a Rainbow

I mentioned recently that the imminent annual rhizome sales by the Monterey Bay Iris Society. If you made notes, you know that the first of two sales happens today, at the Deer Park Center in Aptos. If you didn’t write a reminder to yourself, by the time you read this, you missed it.

Happily, the second sale is a week away, at August 11th at the Aptos Farmer’s Market, located at Cabrillo College. For details, visit http://www.montereybayiris.org.

These sales are very popular: the rhizomes are favorably priced and sell quickly. Their popularity begins with the plants themselves, which most gardeners find both easy to grow and stunningly beautiful. The extraordinary range of colors—and color combinations—that iris blossoms display have earned the plant’s name, which comes from the Greek word for the rainbow.

Iris hybridizers search diligently for new colors, color combinations, patterns and textures, at the same time striving to improve the species in terms of blossom size, number of blossoms, overall form, vigor, resistance to disease and other traits.

The hybridizing process, like that of all flowering plants, seeks to combine the desirable characteristics of two plants. For example, one might have blossoms with very beautiful colors while the other has attractively ruffled blossoms. The hybridizer transfers pollen from the anther of one plant (the pollen parent) to the stigmatic lip of the other plant (the seed parent), plants the resulting seeds and evaluates the progeny. It is up to the plants to produce new plants with a marketable combination of features.

The result of this continuing quest for improvement is an ever-expanding multitude of named varieties and the evolving opportunity for the iris fancier to add to his or her collection. Each year brings new introductions with unique names.

All the new hybrid plants do not combine the desired characteristics as the hybridizer intended. Each trial inevitably yields many new plants that do not improve upon their parents. The hybridizer does not offer such seedling as new named introductions, so we who buy irises for our gardens see only very attractive plants. The “duds” are discarded.

Most hybrid irises are descended from one of just three species in the genus Iris: the German Iris (I. germanica), the Sweet Iris (I. pallida) or the Hungarian Iris (I. variegata), all of which are categorized as “tall bearded” irises. The hybrids of these species number in the thousands—and counting—but the genus includes about 300 species. Gardeners who appreciate the unique form and stunning range of colors of the iris have ample opportunities to look beyond the popular hybrids and explore the long list of naturally occurring species.

More

Iris Cultivation
The websites of the American Iris Society and the Monterey Bay Iris Society provide detailed information on the cultivation of irises.

Mail Order Sources of Tall Bearded Irises (West Coast Growers)

Aitken’s Salmon Creek Garden, Vancouver, WA
www.flowerfantasy.net

Bay View Gardens
(our friend Joe Ghio)
1210 Bay Street, Santa Cruz, CA 95060

Cadd’s Beehive Iris Garden
(our friends Anna & David Cadd)
Healdsburg, CA
(707) 433–8633; caddiris@comcast.net

Fred Kerr’s Rainbow Acres
North Highlands, CA
www.rainbowacresonline.com

His Iris Garden
Merced, CA
www.hisirisgarden.com

Iris Fan, The
Albany, OR
www.theirisfan.com

Keith Keppel
P.O. Box 18154, Salem, OR 97305

Lauer’s Flowers
Independence, OR
lauersiris.com

Napa Country Iris Gardens
Napa, CA
www.napairis.com

Nola’s Iris Garden
San Jose, CA
(408) 929–6307; info@walking-p-bar.com

Pleasant Valley Iris Farm
Vacaville, CA
(707) 451–3367

Snowpeak Iris and Daylilies
Lebanon, OR
www.snowpeakiris.com

Scheiner’s Iris Gardens
Salem, OR
schreinersgardens.com

Superstition Iris Gardens
Cathy’s Valley, CA
community.webshots.com/user/rickt103

Sutton’s Iris Gardens
Porterville, CA
suttoniris.com

Wildwood Gardens
Molalla, OR
www.wildwoodgardens.net

Mail Order Sources of Species Irises
Note: Most growers carry at least a few species irises in addition to the ever-popular hybrid tall bearded irises (called TBDs). The growers listed below place greater emphasis on the many alternatives to the tall bearded irises.

Draycott Gardens (beardless irises)
Upperco, MD
www.draycott-gardens.com

Eartheart Gardens (Siberian & Japanese Irises)
Harpswell, ME
www.EartheartGardens.com

Ensata Gardens (Japanese Irises)
Galesburg, MI
www.ensata.com

Iris City Gardens (Siberian, Louisiana and other beardless species)
Primm Springs, TN
222.iriscitygardens.com

Iris Haven (Louisiana Iris)
Australia
www.irishaven.com.au

Wildwood Gardens
Molalla, OR
www.wildwoodgardens.net

 

Finding Rare Plants

More by chance than by intention, I discover plants that are fairly rare in residential gardens. Invariably, my discoveries are plants that are native to dry summer climate regions, because it is that population within which I seek plants for my own garden.

Incidentally, gardeners who search for plants from climates other than their own garden’s climate are called “zone deniers.” Gardening with plants from exotic zones might appeal to one’s sense of adventure but it involves more challenges than I would enjoy.

Here are three attractive rare plants that I have encountered recently

Blood Flower (Haemanthus albiflos).

Image from Wikipedia (http://en.wikipedia.org)

An evergreen South African bulbous geophyte, related to the Amaryllis. The generic name translates as “blood flower,” reflecting the red flowers of the first species found, H. sanguineus. The specific name of the plant I acquired from the Monterey Bay Area Cactus and Succulent Society means “white flower,” so I now have a white-flowered Blood Flower. The plant is sometimes called “Elephant’s Tongue” for its leaves or “Shaving-brush Plant” for its unusual flowers. This is a very low-growing plant, suitable as a rock garden specimen or indoor plant.

Source (among others): Telos Rare Bulbs <http://telosrarebulbs.com>

Blue Chilean Crocus (Tecophilaea cyanocrocus).

Image from The Scottish Rock Garden Club (http://www.srgc.org.uk)

A very rare geophyte that is native to Chile, but presumed extinct in the wild since 1986. Plant hunters rediscovered it in 2001 and brought back corms. It has been propagated in botanical gardens and is slowly becoming available commercially. The plant, a member of the iris family, has blossoms that resemble those of the Crocus, a different member of that same family. Its flowering stems grow up to four inches tall, and the deep gentian clue flowers, with a whitish center, are just one inch across. In the northern hemisphere, it blooms February to March.

Source (among others): Brent and Becky’s Bulbs (https://store.brentandbeckysbulbs.com)

Golden Fuchsia (Deppea Splendens).

Image from http://www.strangewonderfulthings.com

Another plant that probably is extinct in the native cloud forests of southern Mexico (Chiapas) and Guatemala. This plant flowers in late summer with spectacular clusters of pendulant golden yellow tubular flowers topped by violet-red calyces. Even its leaves are attractive. The plant is not a Fuchsia, but a member of the very large coffee family. One of its many relatives is the Gardenia. Its seeds were first brought to northern California in 1981 and distributed selectively. Most of the plants grown from these seeds were killed by frost, but a few plants survived in the San Francisco Botanical Garden and the Huntington Gardens, and are now slowly becoming available commercially.

Source (among others): Annie’s Annuals & Perennials (https://www.anniesannuals.com/)

Avid gardeners could select these or countless other uncommon plants to enjoy for their beauty and rarity. Not all rare plants are attractive or even garden-worthy, so plants that meet those criteria and will also flourish in our dry summer climate are welcome treasures.

Enjoy your own rare plant discoveries.

 

A Plant so Rare

James Russell Lowell’s poem, “What is So Rare as a Day in June,” offers a lyrical perspective on nature, and suggests the rare (or perhaps just uncommon) plants that avid gardeners find appealing.

At the recent annual plant sale by Cabrillo College’s Horticulture Department, I picked up two that qualify as uncommon.

One is a crested iris, Iris gracilipes, the slender woodland iris from China and Japan, which is where most crested iris species grow.

The crested iris gets its name from a yellow or white crest (like the beard on a bearded iris) along the sepals (like petals). Typically, they are dwarfs, growing about eight inches tall, with violet blossoms about one or two inches across. They prefer a shady, moist spot in soil that is slightly acid. Now I need to find such a place for it in my garden.

My other uncommon treasure from the sale is a Puya venusta, which is called “Chagualillo” in Chile. I already have P. berteroniana and P. coerulea, so I could claim to be a small-scale collector of these Chilean plants. The puyas are bromeliads (pineapple family members) with spectacular blossoms. P. berteroniana, for example, has “6- to 10-foot flowering spikes of metallic, deep bluish-green flowers highlighted by vivid orange stamens.”

Who would —or another gardener—want to own a Japanese crested iris or a Chilean puya?

The obvious explanation might rest on the pleasure of dazzling garden visitors with plants they are unlikely to have seen elsewhere. In fact, one could see puyas at the Huntington Garden or the U.C. Berkeley Botanic Garden, but probably not at a garden center or most residential gardens.

Another, less vainglorious reason for growing uncommon plants is to enjoy them privately for their own sake, and to learn their cultivation.

A truly selfless motivation would be to conserve a plant genus or species that is in danger of extinction. According to California’s Department of Fish and Game (DFG), this state is home to over 6,500 species, subspecies, and varieties of native plants. Of these, 223 are designated under California law as rare, threatened, or endangered. The threat of a plant’s extinction is often based on human encroachment or destruction of the plant’s habitat.

In 1968, the California Native Plant Society began its Rare Plant Program in coordination with the DFG, to develop current and accurate information on “the distribution, ecology, and conservation status of California’s rare and endangered plants.” The CNPS generally wants such plants to thrive in their natural setting, but also endorses “conservation gardens,” as a substitute home for plants that lose their natural habitats to the relentless march of progress.

More

The concept of a “rare” plant could be interpreted in different ways, depending on the interpreter. California’s Department of Fish and Game does not have an official definition for a “rare” plant. California’s Fish and Game Code, however, includes definitions of “endangered” and “threatened” species, as follows:

"Endangered species" means a native species or subspecies of
a bird, mammal, fish, amphibian, reptile, or plant which is in
serious danger of becoming extinct throughout all, or a significant
portion, of its range due to one or more causes, including loss of
habitat, change in habitat, overexploitation, predation, competition,
or disease.
"Threatened species" means a native species or subspecies of
a bird, mammal, fish, amphibian, reptile, or plant that, although not
presently threatened with extinction, is likely to become an
endangered species in the foreseeable future in the absence of the
special protection and management efforts required by this chapter.

The Fish & Game Code also defines a “candidate” species:

"Candidate species" means a native species or subspecies of a
bird, mammal, fish, amphibian, reptile, or plant that the commission
has formally noticed as being under review by the department for
addition to either the list of endangered species or the list of
threatened species, or a species for which the commission has
published a notice of proposed regulation to add the species to
either list.

Some commercial firms that sell plants will specialize in, or feature, plants that they call “rare.” Several such plant purveyors can be located by searching the Internet for “rare plants,” but whether their plants are actually rare in the sense of “not found in large numbers and consequently of interest or value,” is a matter of personal opinion.

These sellers may be expected to employ a relatively inclusive definition of rarity, to avoid a situation in which their livelihood depends on many customers seeking a very small number of plants.

If a plant meets your personal definition of rareness, you can enjoy it even if it could be found in great numbers somewhere else in the world.

Example: At the San Francisco Flower & Garden a few years ago, I bought an enormous bulb of the Giant White Squill, which I had never seen. The bulb was larger than any other bulb I had encountered (they can be as large as a soccer ball, and 8-to-10 pounds), and I had no idea what a Giant White Squill might be, so it certainly qualified as rare in my lexicon.

I soon learned that the Giant White Squill is Urginea martitima, a plant that is native to the Mediterranean Basin and fairly common as a roadside volunteer. No matter: it is still a rarity in my garden.

Snails relish the plant’s large fleshy strap-like leaves, so it has had a tough time in my garden, but I am still expecting to see a flower stalk in August. It could be six feet tall!

Our Eyes on Irises

Now blooming: the magnificent irises.

Most often, you will see hybrid forms of the tall bearded irises. These plants are most popular among the 250 species of irises; hybridizers have been striving for decades to create imaginative new forms of the original plant, the German Iris (Iris germanica).

A comparison of the German Iris with any of today’s hybrids reveals a dramatic difference. The ancestor is an attractive but rather small, rather droopy flower on a short stem, with very few blossoms, usually an unexciting yellow or purple. The modern hybrid is much taller, with proud standards and horizontal falls, multiple stems and blossoms, and any of an astonishing range of colors—anything but true red—and combinations of colors.

The iris, named for the Greek goddess of the rainbow, has inspired legions of gardeners to collect and cultivate newly introduced hybrids and to share the rhizomes with friends (or customers). I have seen several private gardens with scores of different, striking tall bearded irises specimens, in a rainbow of colors, and a mere scattering of other plants. Only roses receive such dedication.

The popularity of the tall bearded iris can distract from other garden-worthy species in the genus iris. Indeed, at least 250 other species have been identified, each easily recognizable as an iris but with a unique look.

The principal groups of species irises are as follows:

Bulbous Irises

This group includes the Dutch, Spanish and English Irises (named most often for the country that popularized them, rather than the country of origin), and the Reticulata Irises (their bulbs have a reticulate or netted covering). Bulbous irises grow from bulbs, rather than from rhizomes.

Rhizomatous Irises

This group is most often hybridized, as already mentioned. The name refers to the colorful and fuzzy “beards” that decorate the falls. The beard serves no known function, but might attract pollinators.

There are two sub-groups of rhizomatous irises: bearded: dwarf, median, tall bearded, aril and arilbred (their seeds have an aril or “collar”); and beardless: Japanese, Louisiana, Pacific Coast, Siberian and Spuria irises.

Species Irises

There are many species irises, each with subtle differences. About eight are popular choices for home gardening. My garden includes an I. unguicularis, called the Winter Iris for when it produces light purple, fairly small blossoms, often hidden among an abundance of leaves. My specimen grew into a large clump, so yesterday I dug it out and used my dull garden hatchet to make four divisions of this Greek native for my Mediterranean Basin garden.

Crested Irises (botanically between bearded and beardless) and Tender Crested Irises (orchid-like blossoms; can be grown warmer spots of the Monterey Bay area).

More.

To learn more about irises…and especially options beyond the popular tall bearded irises…visit these websites:

An excellent (and fairly recent) book for a wealth of information is
Claire Austin’s Irises: A Gardener’s Encyclopedia (Timber Press, 2005).

 

 

 

Succulents for Your Garden

Describing trends in gardening is difficult because no clearinghouse reveals what home gardeners find appealing these days. We might find sales data from suppliers of plants, seeds or other garden products, but that could be biased by commercial priorities (not there is anything wrong with that!).

Another source might be garden-related articles in newspapers and magazines. Garden writers might just invent seasonal trend, so we should ask for reliable information that provides the basis for such claims.

With those disclaimers, I will report a trend that others have declared: that home gardeners in America are demonstrating increased interest this year in edible gardening.

This renewed enthusiasm for growing fruits and vegetables might be documented with sales data, but while the claim is credible, I haven’t seen the supporting facts. The believability of the trend rests on some combination of recession-inspired desire to control food costs and the appeal of freedom from chemicals and industry-inspired hybrids that ship and store well, but lack taste.

Another trend that also lacks documentation, but still rings true, is the gardener’s embrace of succulent plants. This claimed trend is based on the minimal challenges of growing succulents, their minimal—but significant—need for irrigation, and the stunning range of texture and colors in their foliage and blossoms.

To review, “succulents” include all plants that store moisture in their leaves, stems or leaves. Such plants exist within many different genera, so they are not related botanically, but all have adapted to low-moisture environments.

Succulents include cactuses, which typically are spiny and members of the genus Cactacea. They have much appeal, but can be hard to handle.

The vast majority of succulents do not have spines, and store moisture above ground, in their stems or leaves.

Some, called geophytes, survive dry periods by dying back to underground storage organs. Geophytes satisfy the definition of succulents but are not always regarded as succulents. That seems motivated more by established practice than by botanical science.

The specialized organs of geophytes include the following:

• true roots (of a dahlia or carrot);

• modified stems (the corm of a crocus, the stem tuber of a potato, the rhizome of a bearded iris, the pseudobulb of some orchids, or the caudex of the Adenium);

• storage hypocotyl or tuber (of a cyclamen); or the

• bulb (of a narcissus, lily or onion).

To see a variety of succulents, visit the annual show and sale of a local cactus and succulent society. California’s central coast region, for example, has the Monterey Bay Area Cactus and Succulent Society. This group’s annual show and sale in 2012 occurred on April 28 and 29 in the garden area of Jardines Restaurant, in San Juan Batista. This event offers a consistently impressive show, good prices for plants, a satisfying Mexican lunch at Jardines and another fine opportunity to enjoy gardening.

More.

Visit the extensive website of the Cactus and Succulent Society of America. This website’s many resources include links to local affiliates. (There are twenty-five in California alone!) Also, see the Events Calendar for national, regional and local events, plus a selection of international events.

A well-regarded book on growing succulents in containers is Debra Lee Baldwin’s Succulent Container Gardens: Design Eye-Catching Displays with 350 Easy-Care Plants (Timber Press, 2010)

Search for “cactus and succulent” books on Amazon.com, or visit your local library.

 

Selecting Roses

If you have visited your favorite garden center recently to look at the roses, you might feel overwhelmed. There are so many different plants offered for you to plant that it is difficult to choose.

For example, McShane’s Nursery in Salinas (www.mcshanesnursery.com) has posted its current rose list, with scores of bush roses, plus groundcover roses, English roses, tree roses, and climbing roses.

When studying this list, don’t just click “print.” I did and now have a six-page list, a half-page of growing tips, and seventeen blank pages! This didn’t kill more than a very small tree, but it’s a waste nevertheless.

You can also become overwhelmed by browsing to www.regannursery.com, the website of Regan Nursery in Fremont, California.

Dealing with such rose lists or inventories you visit requires a strategy. Decide first on what you need or want for your garden (bush, groundcover, tree or climbing roses), so you could focus on plant selection.

The bush roses are basically hybrid teas and floribundas. Thousands of cultivars are available, with new ones on the market every year.

The English roses, also called shrub roses, are plants England’s David Austin has bred. He combines fragrant old roses (Gallicas, Damasks, Albas and others) with modern roses, e.g., hybrid teas and floribundas, which offer a wide range of colors and repeat flowering. These are deservedly popular plants. Check them out at www.davidaustinroses.com.

Tree, groundcover and climbing roses are I hope obvious.

Once the gardener has decided the category of rose wanted/needed, most will chose for blossom color. This is a not a bad approach, but it misses other interesting and productive strategies.

A different approach is to select a rose that is highly rated for overall performance. Look for such ratings in the American Rose Society booklet, 2012 Handbook for Selecting Roses: A Guide to Buying Roses (inquire at ars@ars-hq.org).

Another approach for the adventuresome gardener: collect uncommon species. Of the 100 species of the genus Rosa, the major ones are the white rose (R. alba), the dog rose (R canina), the cabbage rose (R. centifolia), the summer damask rose (R. damascena), the French rose (R. gallica), the eglantine rose (R. rubiginosa) and the rugosa rose (R. rugosa). Each has unique appeal.

An intriguing choice is the winged thorn rose (R. sericea f. pteracantha), a Chinese native. Its distinctions include large size (six-to-eight feet tall), white flowers with just four petals and very large, bright red thorns. Best at the back of the garden bed!

One mail order source of such roses is Vintage Gardens in Sebastopol, California. (www.vintagegardens.com).

Enjoy the Queen of the Flowers in your garden!

Selecting Fruit Trees

Our weather continues to be cool, so February is still a good time to plant bare root roses and trees—especially fruit trees, for their productivity. Garden centers have good inventories of both kinds of garden treasures.

When considering the options, the gardener must ask, “Which would be a good choice?”

In both cases, clear and reliable advice is available from Orin Martin, of the Farm & Garden at the University of California, Santa Cruz.

Martin has recently summarized his knowledge of trees for the home orchard in the Monterey Bay area. He reports what grows well: Apples, European and Asian Pears, Quinces, Plums, Prune Plums, Pluots (more Plum than Apricot), Persimmons, and Walnuts.

Fruit trees that he says grow “passably well” include Figs, Peaches and Nectarines, Apricots/Apriums (more Apricot than Plum), Cherries. Some varieties of Figs and Cherries are more reliable than others.

Finally, those that grow poorly here include Almonds and most other nut species, most Cherries, most Pomegranates, and Green Gage Plums.

Martin provides a helpful discussion of chill hour requirements for fruit trees. This refers to the cumulative hours between 32 and 45 degrees Fahrenheit that a fruit variety needs to break dormancy and grow well. This measure reflects the northern temperate zones of Europe, Asia and North America where most fruit trees originated.

Martin notes that weather conditions vary considerably with distance from the coast and elevation, and typically range from 500 to 800 hours of chill per year. Some varieties require many more chill hours (up to 2,500). The gardener is well advised to choose varieties with chill requirements that can be met in his or her garden.

Finally, Martin lists the chill requirements for several fruit varieties that are reliable in this area. He refers specifically to Santa Cruz County, which he knows best, but his advice is valid for Monterey County as well.

Here are average chill hours for locations within Monterey County, as reported by the University of California, Davis.

  • Arroyo Seco                         837
  • Carmel                                 822
  • Castroville                           743
  • King City–Oasis Road         857
  • Pajaro                                  635
  • Salinas North                      734
  • Salinas South                      752

Gardeners who plan to plant a fruit tree or two will find value in Martin’s article, which is online and free. Here’s how to find it. Browse to the website, casfs.ucsc.edu/publications; click on “News and Notes,” and then click on “Winter 2012 Issue.”

Also, from the Publications page, click on “For the Gardener” for several brief articles on organic gardening.

Next week: the selection of bare root roses for this area.

Enjoy your garden!

Landscaping with Succulents

A select group of home gardeners advocate high-maintenance gardening. They cultivate bonsai plants that must be watered daily and clipped frequently, tropicals, e.g., orchids or other plants that are native to hot and humid parts of the world, or plants that require a lengthy cold spell to perform their best.

Another group grows mostly plants that are content with the local climate. For Monterey Bay area gardeners, these plants are in the summer-dry (or Mediterranean) climate zones of the world. Let’s call them the practical gardeners, willing to do seasonal maintenance.

Then, we have home gardeners who aspire to low-maintenance gardening. Those who have very busy lives want beautiful and interesting gardens that require little of the gardener’s time.

These gardeners have two basic pathways to consider. One emphasizes hardscape and minimal vegetation. The aesthetic might be a classical Japanese garden, which uses stones, sand and gravel symbolically, or a severely modern garden, as might be featured in Garden Design magazine. Maintenance of these gardens can involve much sweeping or raking.

Another pathway to a low-maintenance garden relies on succulent plants, which have become fashionable in recent years.

Succulent plants store water in their leaves or stems. Some store water underground, in their roots, modified stems (e.g., corms, rhizomes, etc.) or bulbs. This latter group of succulents has been called geophytes (“earth plants”).

One large group of succulent plants is the Cactus family (Cactaceae). All cacti are succulents, but many other plant families include succulent species. They are found in a wide range of botanical classifications, but they have in common adaptation to dry environments.

Here are some ideas for landscaping with succulents.

While dry environments often are hot and sunny, succulents also grow in places that are relatively shady and cool: they are not limited to desert environments, but can thrive in a wide range of garden situations.

Succulents have several distinctive leaf and stem colors: many variations on green, blue and silvery blue, as well as reds and yellows. Landscape designers recommend grouping cool colors or hot colors, but not both.

Many succulent blossoms tend to the hot colors, and are relatively short-lived. Bulbous plants, however, produce blossoms in a wide range of colors.

Succulents range greatly in size, from low-growing sedums to 50-foot yuccas, and everything between. Designs can vary plant heights for visual interest. As always, select plants that will still fit when they reach mature size.

Succulents are low-maintenance choices for containers. Many smaller varieties grow well in shallow bowls. Succulent fanciers select containers with great care.

In a mixed bed, complement succulents with softer-textured plants: grasses, sages, etc.

Succulents will add considerable interest to your garden, and require very low maintenance. Try a small grouping to learn more.

Blossoms in WInter

At this time of the year, gardens could be at rest and —let’s be blunt—relatively bleak.

Still, depending on the plants in your landscape, there could be a gratifying display of blossoms and foliage, or at least scattered bright spots that mimic the spring.

This year, of course, the weather has been extraordinarily dry and warm, fooling some plants that the warmer season has arrived. My many daffodils, liberated by last fall’s division of crowded clumps, are beginning now to bloom.

My daffodils are all the same cultivar, Mon Cherie. There are other varieties as beautiful or more beautiful, but for larger areas I prefer massing the same plant rather than collecting multiple cultivars. A floriferous hodgepodge could bewilder the beholder.

My garden, like most, has only a few winter bloomers. They get attention simply because they are surrounded by plants that are declining.

Here is a sampling of what’s now in bloom in my garden.

Winter Daphne (Daphne odora ‘Aureomarginata’)

This evergreen, shrubby plant from Japan has leaves with yellow margins and pinkish buds that open to pure white. Its great value in the garden rests on the fragrance of its blossoms, which rank among the most pleasant in nature. The species has several potential problems with insects and diseases and a reputation for sudden death but my specimen has had no health issues for several years.

Paper Bush (Edgeworthia chrysantha)

This relative of the Winter Daphne carries the name of Michael Edgeworth, a 19th century plant collector. The plant, a native of China’s Szechuan province, produces clusters of buds that open into buttery-lemon colored, very sweetly fragrant flowers in early March. (I check it regularly!) The Chinese use its bark to make high-quality paper for currency.

Corsican Hellebore (Helleborus argutifolius)

This robust Mediterranean species, with pale-green, cup-shaped flowers, is probably the most common of the genus. It proliferates freely in my front yard, and often attracts attention. I whack its three-foot stems in the spring, for renewal, and it comes back stronger than ever.

Winter-blooming Iris (Iris unguicularis )

The evergreen Grecian iris, which has just finished blooming, offers off-season iris blossoms as complement to the familiar tall bearded iris. Its flower stems are shorter than the leaves, so the pretty blossoms are not easy to find, nestled within the plant.

Torch Aloe (Aloe arborescens)

This big South African plant is widely grown on California’s central coast for its dramatic coral-red flower spikes, rosettes of soft green succulent leaves and minimal demands. My plants bloomed later than others in the area, probably because they get some shade.

What’s blooming in your garden? Survey your landscape now to appreciate the present color and consider planting more that would enliven the dormant days.

New Plants in the Vegetable Garden

At this time of the year, we when might enjoy a snow flurry, we have instead a flurry of garden catalogs.

The seasonal catalogs feature the latest crop of floral and vegetal hybrids. The latest creations are always interesting, but I generally prefer the more reliable species.

For the first time this year, The Territorial Seed Company is offering something really different: grafted vegetable plants. All are in the same genus Solanum, known as the nightshades: one eggplant variety (Prospero, an Italian heirloom), six single tomato varieties, and two double tomato varieties, i.e., with two varieties grafted on one rootstock.

Territorial Seeds states that grafted vegetable plants are superior to non-grafted plants in several ways. They produce larger crops of higher quality, resist diseases more effectively, have greater more vigor, etc. They can be planted earlier and harvested over a longer period, and require less treatment with pesticides.

Grafting involves splicing a shoot (the “scion”) from one plant to the rootstock (the “stock”) of a compatible plant. The rootstock is selected for desirable traits, e.g., disease resistance, overall vigor, and the like. Likewise, the scion is selected for stems, leaves, blossoms or fruits that the grower prefers. By combining the traits of the scion and the stock, the grower intends to produce a superior plant.

Grafting, a form of asexual propagation, is a fast alternative to hybridizing, which involves sexual propagation of two compatible plants to create a desirable combination of their traits.

Many grafted plants are available to the home gardener. Dwarf apple trees, for example, are usually grown by grafting the scion of a favored variety to the stock of a dwarf variety. The most popular rootstocks are the M26, which produces dwarf trees, 10 ­ 12 feet high, and the M7A, which produces semi-dwarf trees, 14 – 16 feet high.

As another example, roses are often sold as grafted varieties, which typically grow faster and more vigorously than “own root” roses. By comparison, roses grown on their own roots are more true to their variety’s traits and growth habit, hardier and longer lasting. The popular rootstocks for hybrid roses are Rosa multiflora (the “Japanese rose”) and Rosa canina (the wild “dog rose”).

Grafted roses, it must be noted, also have a tendency to sucker, i.e., the rootstock sends up a cane of its own, with leaves and flowers that differ from the grafted variety.

A friend once showed off a rose plant that delighted her by providing both white and red blossoms, not realizing that she had a sucker in flower. That’s not a problem, except that the cane from the rootstock draws energy from the grafted variety and invariably produces inferior blossoms. For these reasons, suckers should be torn from the rootstock (not clipped) when they are noticed.

Despite the familiarity of grafted fruit trees and roses bushes, grafted vegetables are still new to me. When I dug into the topic, I discovered that Asian growers have grafted vegetable plants for hundreds of years to increase plant vigor and productivity, and reduce susceptibility to disease. The technique was introduced into the United States about twenty years ago. Growers that sell to home gardeners have only recently begun to offer grafted vegetables. If grocery stores are selling vegetables grown on grafted plants, they are not labeling them as such. Many people want genetically engineered (“GE”) vegetables to be labeled, but might not be as concerned about grafted vegetables.

Japanese companies have developed robots to reduce the cost of grafting. The process requires careful handling of the young shoots, but can be reduced to instructions to a machine. Robotic grafting machines can produce up to 900 grafts per hour, but they require two or three workers to assist the machine.

If you are interested in trying something new in your vegetable garden this year, you might try a grafted tomato, to see if it lives up to its promises. Territorial Seeds apparently does not yet have a robotic grafter, so it offers hand-grafted plants. The price is $7.50, which is twice the price of an “own root” tomato of the same variety. Buying seeds is of course much less expensive per plant.

Check it out at www.territorialseed.com (look for “Grafted Vegetable Plants” under the “Live Plants” menu).

Even though this technique is quite old in some parts of the world, the introduction of grafting equipment could lead to a growing selection of grafted floral and vegetal “super plants” that are bigger, faster, sturdier, healthier and otherwise behave like products of the modern era.

Enjoy your garden!