The Stars of Winter

Databases are wonderful things. They allow quick sorting of information, and make it easy to compare for specific criteria. One that I’ve been working on for some time is a database of flowering plants by their month of bloom in the Sacramento Valley. Well, let me tell you: December and January compare rather bleakly in the category of showy flowering plants! I know, I know, in Northern California we have much to be grateful for this time of year. After all, as I write this it’s below zero in New England and below freezing throughout the southwestern states. But compare my list so far: blooming in April? 103 types of plants. Blooming in December? 31. Now among those 31 are some great, reliable, prolific bloomers. Pansies and violas come in colors across the whole spectrum, some with the familiar fun faces. Snapdragons give an excellent show starting in late winter. Cyclamen are available in startling shades of pink, red, rose, and clean white. Euryops pectinatus (Golden bush daisy) shows off bright yellow daisies from October well into spring. Even the culinary rosemary is covered with blue or violet flowers during the foggy winter months. And there are some shrubs which bloom in winter. Two are wonderful but fussy, though for different reasons. Camellias, of course, are the trademark flower of Sacramento, with the ‘japonicas’ being the most familiar. But as they prefer acid soil conditions, our hard water requires that we fertilize them regularly with a special fertilizer. Winter Daphne has powerfully fragrant blossoms on a plant which requires perfect drainage. Worth the effort for sure, but I’ve killed my share of these. But savvy gardeners look beyond the flowering plants for seasonal interest in the garden in December and January. Some plants have showy berries. Others have interesting foliage from seasonal pigment changes, natural variegation, or contrast provided by the leaf or needle texture. Some trees even have interesting bark which becomes more noticeable as it darkens in the rainy season. Some of these are common landscape shrubs which fade into the background during riotous spring or langourous summer, suddenly standing out as deciduous shrubs and trees go bare, and herbaceous perennials die back to their roots. How about Nandina? The common Heavenly bamboo is used widely because it grows in shade or sun, is narrow and upright, and has nice soft foliage. The foliage of ‘Compacta’, a shorter and denser form, turns a bright red from late November through January, and the orange-red berries of the larger Nandina cultivars can be very showy. ‘Firepower’ and ‘Nana Purpurea’ are very dwarf forms with vivid purple-red winter foliage. Everybody knows Pyracantha, the large thorny shrub with the bright red berries. But Cotoneaster (usually pronounced Coe-toe-nee-aster) gives equal beauty -- and benefit to songbirds -- on a thornless shrub. Cotoneaster lacteus (Red clusterberry) rivals Pyracantha in size. Many forms grow as low ground covers, including C. congestus, C. dammeri, and C. horizontalis. Each has rosy or dark red fruit. Other shrubs showing colorful berries right now include Barberry (Berberis), Beautyberry (Callicarpa), Holly (Ilex), and some varieties of roses with their interesting and elegant hips. If you have a dry garden, the California native Toyon (Heteromeles) is a slow-growing but tough shrub, sometimes called Christmas berry for the shiny deep red fruit. One tree that has come into the trade in a big way in recent years provides lots of winter interest. Arbutus ‘Marina’ is something of a mystery plant. Introduced to the trade by the Saratoga Horticultural Foundation, “it is probable that it arrived in San Francisco in 1917 for the Exposition as part of a consignment of plants from Europe.” It is probably a hybrid involving three different species of Arbutus. ‘Marina’ is closely related to our native madrone, and has a similar mahogany red trunk, but is much easier to grow. Like its Irish cousin Arbutus unedo, it has soft fuzzy oranges fruit, but not so many as to be messy. The rosy pink flowers begin in fall and last into winter, even as the previous year’s fruit is in color. ‘Marina’ can grow in light shade or full sun, can tolerate drought or reasonable lawn watering, grows slowly and is easily kept at 10 – 20’. There are a few other trees with showy fruit hanging into winter. Citrus, of course, are dual-purpose. Probably the most attractive landscape Citrus are the kumquats, with their profusion of colorful fruit. Kumquats also happen to be among the hardiest citrus, and grow slowly enough to be a landscape shrub or small tree. Hawthorn trees (Crataegus species) are noticeable here and there around town, as some species carry their little apple-shaped, bright red fruit long after the leaves are gone. But most are prone to fireblight, a devastating disease in this area, and the one resistant type is very thorny and not common in the nursery trade. California pepper (Schinus molle) is a lovely tree with dangling clusters of dry red berries on the female trees. But brittle branches and aggressive roots make this mostly a choice for rural areas. California pepper does have interesting winter bark, as do many other trees. The character of bark can be a point of interest on a well-placed tree, especially when winter moisture brings out the highlights of the wood, and lighting from below can enhance this feature. As you choose a tree for a focal point, consider the afore-mentioned Arbutus ‘Marina’, Crape myrtles (Lagerstroemia hybrids), or even some of the smaller Eucalyptus species. Camphor tree (Cinnamomum camphora), ultimately a very large broad-leaved evergreen, has attractive foliage and smooth black bark when wet. Catalina ironwood (Lyonothamnus floribundus) is a coastal native which can be seen in the Arboretum near Mrak Hall. Incense cedars (Libocedrus decurrens) and many pines round out the list. The winter landscape palette includes plants selected for elegant charm and rugged character -- if can look beyond ‘just’ flowers for seasonal beauty on winter’s gray and gloomy days. from the Davis Enterprise