Winter Color

Do weeks of staring at snowy white landscapes have your eyes screaming for color? Winter gardens don’t have to be drab, lifeless affairs. Flowers may not be in bloom, but many plants have leaves, stems, or berries in shades of bright red, golden orange, or silver-blue and plum. Put them together and your winter garden springs to life.

Mahonia repens (also known as Oregon Grape Holly)  is an attractive groundcover year-round, but it really shines in winter. While other plants shed their leaves, Mahonia’s foliage turns a stunning bright red.

Yellow flowers in spring and showy blue berries in early fall add to this native’s year-round interest. Mahonia repens is drought tolerant, and handles full sun to part shade.

Juniper horizontalis ‘Blue Chip’ is another groundcover that remains attractive all year. While many junipers grow much too large for our small yards, Blue Chip stays under a foot high. Its feathery foliage is a beautiful steel-blue all year, with the addition of silver-plum tips in winter. Plant it in full sun, where it will quickly spread up to ten feet in diameter. Junipers are very xeric once established.

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Dwarf Mistletoe is not for kissing

Sparse foliage and a witches' broom indicate a mistletoe infection.
Sparse foliage and a witches’ broom indicate a mistletoe infection.

Mistletoe is a holiday tradition. We decorate our doorways with it, where tarrying under a spring might bring you a kiss. Unfortunately, the kind of mistletoe growing along Colorado’s Front Range isn’t so romantic. Five different species of dwarf mistletoe infest pines, spruces and firs. Given enough time, an infected tree will eventually die.

All mistletoes are flowering plants that have given up a life of self-sufficiency to become harmful parasites. Dwarf mistletoes lack leaves, so they have little ability to make their own food from sunlight. Instead of extending their roots into the soil, they have root-like structures that penetrate under the bark, where they siphon off both water and nutrients from the host tree.

The female mistletoe plant produces sticky seeds. When the seed capsules are ripe, usually in late summer, they explode, expelling their contents at speeds up to 60 mph! The seeds can travel up to 60 feet, although 30 feet is more common. Wherever the seeds hit, there they stick.

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Christmas Cactus (Schlumbergera sp.)

christmas-cactus_home_20091103_lah_5353x-1Small succulent-looking plants covered with huge, florescent  red, pink or white flowers are featured prominently in many stores right now. Go ahead get one. You won’t regret it.

Christmas (or Thanksgiving) cactus are both beautiful and easy to grow.

Yes, they’re cactus, but these plants are native to tropical rain forests in the mountains of Brazil, where they grow on tree branches as epiphytes. That should tell you that they like to be kept somewhat moist, but never soggy. This is particularly important while the plants are in bloom. In fact, uneven watering is a main cause of blossom drop. (Another is an abrupt decrease in humidity, such as comes when you move a plant from the greenhouse to your home.) The rest of the year, they are a bit more forgiving, and will tolerate a bit of drying out. It’s always best to let the top inch of soil dry out between waterings.

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Flowering Cabbage (Brassica oleracea)

_dbg_20090915_lah_0651Cold-resistant flowering cabbage takes the stage after tender annuals have succumbed to Fall’s first frosts. Flowering cabbage isn’t really a flower, but a loose head of large ruffled, fringed, or smooth leaves in vibrant combinations of cream rose, purple, and green. Although grown as an ornamental, flowering cabbage, also known as ornamental or flowering kale, is completely edible.

Technically a biennial, these cabbages are grown for the open rosettes that forms the first season. Summer heat results in stunted or leggy plants that are often attacked by cabbage loopers; plants are at their best in cool fall weather. Frosty nights intensify the colors. In late August or September, set seedlings out 15 – 18 inches apart in full sun. All cabbages prefer rich, moist soil.

Ornamental cabbages are most typically massed as bedding plants. Plants continue to look attractive for a while after the ground freezes. Use for fall/winter color, contrasted with dormant perennial grasses in shades of tan and gold, or harmonizing with groundcovers, such as some junipers, that turn purple in winter.

Cotoneaster Offers Berries, Fall Color

cotoneaster-apiculatus-cranberry-cotoneaster-dbg-28jul04-lah-411As summer’s flowers fade, plants that produce berries take center stage. Branches covered with bright red berries make cotoneasters especially attractive now, but they offer year-round interest. In spring, tiny but abundant white to pink flowers may be obscured by the shiny round green leaves. Foliage turns orange-red in fall. Finally, the berries persist into winter, or until the birds pick them clean.

cotoneaster-in-winter-dbg-lah-002The hardest part of growing cotoneaster is pronouncing it correctly (it’s “ko-TON-ee-AS-ter”). These shrubs thrive with little attention, handling poor soils, full sun to afternoon shade, and moderately low amounts of water. New shrubs should be coddled a bit until vigorous growth begins. Give plants room to spread, pruning only to remove oldest wood and enhance appearance. As with all members of the rose family, cotoneasters are occasionally susceptible to fire blight; some new varieties are tolerant of this disease. The many different species in cultivation vary in hardiness. Most will survive zone 4 or 5 winters, but check the label for the variety you are purchasing.

There is a size and shape for every use. Spreading plants under three feet high make good groundcovers. Try planting them where their arching branches can spill over a wall. Small, stiffly erect shrubs may be used as informal hedges. Tall, fountain-shaped growers form good screens.

Don’t Blame Goldenrod

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Goldenrod—Solidago virgaurea

Mention Goldenrod, and most people think of allergies. Yet, this showy, late-summer perennial is receiving a bad rap. The insect-pollinated flowers do not release pollen into the air. It’s ragweed, blooming at the same time, that usually causes any sniffles. Goldenrod, with its fireworks displays of yellow flower clusters, deserves to be much more appreciated.

The hardy plants range from two to four feet tall, depending on cultivar, and look best planted in groups of five or more. They prefer full sun and amended, moist soil, although they can adapt to drier conditions.  The blooms attract butterflies. Try planting goldenrod with other semi-xeric flowers such as Shasta daisies, or purple asters or coneflowers to provide a welcome contrast.

Most garden cultivars are hybrids derived from either our native species or those imported from Europe. Self-sown plants may not come true to form, so flowers should be deadheaded before seeds mature.

Perennial Sweetpea – Lathyrus latifolius

lathyrus-latifolius-perennial-sweetpea-home-lah_5796Perennial sweetpea is a lovely, old-fashioned flower—one that grandmother might have grown. The keeled pea blossoms, ranging from a blushed white to a deep rose pink, form a clump atop long stems. Lanky vines sport sparse foliage. Bloom will continue from now until early fall if spent flowers are removed. If left to mature, the round, spiral pods will suddenly twist open, flinging their seeds several feet into the air, and sowing plenty of new vines in your garden.

lathyrus-latifolius-perennial-sweet-pea-home-lah-010While the more familiar annual sweet peas don’t do well with Colorado’s wild weather gyrations, this perennial form thrives here. The plants are long-lived, growing six feet long by the end of summer and then dying back to the roots in winter. They cling with tendrils, so some supportive netting is helpful.

Difficult to find as plants in nurseries, perennial pea is easily started from seed. Soak the seeds overnight to hasten germination and then plant in average garden soil in full sun to part shade. Go light on the watering.

With their cottage garden appeal, the vines combine well with clematis and roses, or you can grow them on a fence. They are also suitable as cut flowers. The only drawback is that the blossoms lack the wonderful fragrance of the annual sweet peas.

California Gold

eschscholzia-californica-california-poppy-dbg-2003jun03-lah-005-1
California Poppy—Eschscholzia californica

With their vivid orange, saucer-shaped flowers, California poppies are familiar to anyone who has lived in the West. The showy blooms are set off by gray-green, fringed foliage that grows about six inches high. Named varieties may have double flowers, frilled petals, or come in a wide assortment of colors.

Although Colorado may lack the poppy-covered hillsides of the Golden State, these wildflowers are easy to grow here. They are not fussy about soil. Sow seeds directly into the sunny garden in early spring. Melting snow should provide plenty of moisture for germination. Watering during dry spells will keep these drought-tolerant plants blooming for several months. Although the tender plants won’t survive a Colorado winter, allowing them to self-sow will ensure plenty of flowers for next year.

California Poppies are perfect for naturalizing among native grasses or in a rock garden. Try growing them in a parking strip, or along a long driveway. They quickly fill in bare spots in a new landscape.

Dalmation Toadflax – Linaria

linaria-toadflax-santafetrailcsco-2008oct07-lah-001More charmingly known as Butter-and-Eggs, the common name “Toadflax” applies to several similar species. All sport cheerful yellow flowers resembling snapdragons, to which they are related. Two-foot tall clumps of smooth green stems are covered with narrow, pointy leaves two and a half inches long. The flowers appear whenever growing conditions permit.

Originally imported from Eurasia as ornamentals, the plants quickly escaped cultivation and are featured on many wildflower posters. Unfortunately, Toadflaxes are now officially listed as noxious weeds. As such, it is illegal to grow them or sell their seeds.

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Dwarf Periwinkle – Vinca minor

vinca-minor-xg-may142008-lah-001rs-1Appearance
With violet-blue blossoms scattered like stars across a field of emerald green, Dwarf Periwinkle is a popular groundcover in the Pikes Peak region. Also available in white and purple-red, these 5-petaled pinwheel-shaped flowers bring welcome color to a shady spot. The shiny leaves are arranged along stems that may reach three feet in length, but the plants are only six inches high. (Another species, V. major, gets much larger.) The stems will root wherever they touch the ground.

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