Dicentra
As much as we are looking forward to summer heat and sun, we will be equally grateful for a bit of cool, shady respite. Many of us living in older neighborhoods enjoy mature trees that provide quite a bit of shade. These present a challenge: what plants will thrive beneath them and in their shadow? Right now, Harlequin’s has our biggest selection of plants for dry shade, moist shade, and moderate shade.[Read More]
Mikl with Desert willow
Desert willow in bloom
Harlequin’s Gardens is famous for our selection of Native Shrubs. Not only do we have them when few other nurseries do, but we know them and we have mature specimens planted in our display gardens. These woody plants that are so well adapted to Colorado conditions are often drought tolerant, low maintenance, bee and pollinator-supporting, wind-tolerant, cold-tolerant and good-looking. Like many shrubs, some benefit from a once-a-year pruning to remove dead flowers before they make seeds. This will make them more tolerant to drought and snow and wind, but seeds can be left for the birds and pruned late fall.
Native shrubs can be grown together for a very water-wise and low maintenance garden that is tied together visually with a fine woodchip mulch.
Fernbush (Chamaebatiaria millifolium) is a beautiful Plant Select® shrub that is usually 4’- 6’ tall and wide with fern-like leaves that come out in mid January or February. It is very tolerant of dry conditions, heat and bright sun. In summer, clusters of small white flowers cover the bush densely and often bloom a little more in fall. These flowers are extremely attractive to beneficial insects, especially native, non-aggressive wasps which help keep down populations of pests and are intent on pollen, not people. This shrub is tough enough for the back 40 and attractive enough for the front yard. It can be sheared (or pruned) lightly after blooming for a tidier appearance and to encourage rebloom. Fernbush is native to Idaho, Utah and northern Arizona.
Fernbush
Chilopsis linearis is called Desert Willow because it has narrow, willow-like leaves and is very drought-tolerant. It is a small tree 6’-15’ with an open structure and does not leaf out until May, even late May. It is related to Catalpa tree and Trumpet Vine. The orchid-like flowers are so surprising and breath-taking; ruffled, trumpet-shaped, pink to red-purple, striped purple inside. Chilopsis prefers dry, loose soils, but clay is OK if it is seldom watered. At night it is visited by hawkmoths and is scented of violets according to Bob Nold. He also says it “…is the toughest shrub that can be grown in our garden…I have never watered my plants.” The flowers bloom for a long time and are followed by narrow pods that are not messy. Chilopsis is native to New Mexico, Nevada and Utah. Books often say it is hardy to zone 7, but we have specimens over 10 years old at Harlequin’s and Denver Botanic Gardens has many older trees. Often, the flowering tips die and look better pruned off.
Dwarf blue rabbitbrush
Dwarf Rabbitbrush (Ericameria or Chrysothamnus) has been called The Gem of the Tribe. It is a compact shrub 1’-2’ high and 2’-3’ wide with short and narrow bluish leaves and clouds of golden yellow flowers in throughout autumn. The flowers are very attractive to pollinators; it is a crucial late-season food source, supplying nectar and pollen for native bees, honeybees, Monarch and other butterflies, moths and even hummingbirds. Once established, this shrub thrives with little or no watering. It also provides a welcome display of color in the late season and if it is sheared after flowering, will stay compact and attractive enough for the front yard. It is native near Harlequin’s in the open and dry high desert and steppe, and in much of Colorado.
Whoever heard of Goji Berry 20 years ago? Now, with the current interest in superfoods, phytonutrients and antioxidants, Goji Berry juice and dried fruits can be found in many urban grocery stores. The 70+ species of Lycium are found on most continents and one species, Lycium pallidum, is native to Colorado. But the best known and most grown Goji is Lycium barbarum, the Chinese Wolfberry, also known as Matrimony Vine, Desert Thorn and Boxthorn. What is not commonly known is that this exotic superfood can be easily grown in Colorado.[Read More]
Curl-leaf Mt. Mahogany (Cercocarpus ledifolius)
This tall shrub or short tree is a beautiful broadleaf evergreen that is native to Colorado and much of the west up to 9000’. It’s narrow, curled leaves are an adaptation to reduce exposure to drying sun and wind; consequently it is very drought resistant, needing no irrigation after being established.The leaves are also thick, leathery, resinous and dark green above and pale below. Flowers are mostly inconspicuous and the fruit is only 1/4” long with a 2”-3” long silky tail. In dry weather these tails twist like a cork screw and with a little wind can be carried a good distance and then they will screw the seed right into the soil.[Read More]
In the last issue I discussed the easy broadleaf evergreens for Colorado and this time we will go into the difficult ones. Many people have killed or had poor success with rhododendrons, hollies, azaleas and daphnes etc. so it is good to understand these plants further. Unfortunately in my sunny, low-water gardens, I have had little experience with them so I went to two people who have plenty of experience, Don Zaun and Allan Taylor.[Read More]
In the winter when the deciduous plants have dropped their leaves, the evergreens really stand out. If we go for a walk, especially in the older neighborhoods, what evergreens do we see? The greatest numbers are spruces, firs, pines and junipers. In general these conifers with their narrow needles or scales are adapted to our cold temperatures, strong winds and sunny winter days. But there are other woody evergreens to be seen in Colorado neighborhoods: the broad-leaf evergreens. In general their wide leaves transpire more and are more prone to desiccation in our drying conditions; however by choosing the right plants and siting them in their right places, we can enjoy these less popular but deeply satisfying winter-green shrubs and vines. In this article I will discuss the easy broad-leaf evergreens for Colorado and in the April issue we will talk about the difficult ones.[Read More]
Fortunately, there are many choices of drought-tolerant shrubs. And not only can they tolerate drier conditions, the fact that they are taller than most perennials and groundcovers helps them to compete better with weeds, giving them a greater survival potential in untamed, harsh or more industrial locations. In native ecosystems, it is often the shrubs that begin to pioneer a barren ground, and the shade and wind-protection they create, gives more favorable microclimates for other plants to germinate and find a home. There are many fine non-native shrubs for xeriscapes, but in this article, I am mostly going to describe some of my favorite native shrubs for drier conditions.[Read More]
Here’s a shrub that won’t grow over the living room windows, spread half-way across the driveway or send suckers up in the perennial border. It stays a compact 2’-3’ high and a little wider. It’s name comes from its spring leaf coloration which begins a russet or bronze-red mixed with yellow, changing to yellow-green and then green. The flowers are pinkish and bloom for a long time. Then again in the fall the spring leaf colors return to a golden copper-orange. This variety is very heat tolerant and has been successful in my xeriscape garden for 7-8 years. Occasional winter dieback has been slight and easily sheared off with hedge clippers. I also use the hedge clippers to remove the spent flowers after blooming.[Read More]
Nearly everybody has met the memorable fragrance of mockorange, said to imitate the smell of orange blossoms. There are over a hundred species of Philadelphus, and of these, about 40 are native to North America. Many of the yards of Boulder County and Denver have at least one specimen. What is so good about this shrub? Dirr says, “In flower they are attractive to some, but the rest of the year are real eyesores.” Wyman said their fall color is not vivid, their fruits are not ornamental, no winter interest, but they are “cultivated 50 weeks of the year in order that their flowers may be appreciated for two weeks.” However I happen to love mockorange, and one of the 2001 Plant Select shrubs is ‘Cheyene’ Mockorange. So let’s look into the good qualities.[Read More]
Saskatoon Serviceberry (Amelanchier alnifolia)
A winter-hardy (zone 4) native shrub of the Great Plains and Rocky Mountains. It has beautiful coarsely toothed leaves that are attractive even in the dry summer. The flowers are white and apple-like, fragrant and appear very early in the spring. Delicious blueberry-like fruit follow in midsummer. Birds are very fond of them and the American Indians used to mix these serviceberries with fat and buffalo meat to make their winter staple, pemmican. The Canadians have been working to develop this plant for fruit production.[Read More]
There has been a lot of interest at our nursery, and in current plant-breeding programs for smaller shrubs. Most of the old-time favorite shrubs are very large. Most lilacs, viburnums, honeysuckles, forsythias, privets, elderberries, serviceberries, butterfly bushes and hibiscus are 6’-12’ high and often as wide. These are great to provide screening and big masses of color along fences or the back of the border.[Read More]
Cotinus, known as Smoketree, is a genus of woody plants appreciated for their “smoky” flower plumes and for their leaf color, especially in autumn. Michael Dirr in his famous Manual of Woody Landscape Plants says “…it may be the best of all American shrub/trees for intensity of color.” Two species and many selections and hybrids offer leaf colors ranging from rich blue-green, maroon red, purple-red and yellow-gold; and the fall colors are even more vibrant. With the current passion for new plants, it is curious that Smoketree is not seen more often in our western landscapes.[Read More]
The 2017 Plant Select shrub introduction is a woody plant with a tongue-twister of a name, a long history of survival at the old Cheyenne Horticultural Station, and has a heart-warming story of two great local plantsmen who brought it out of obscurity into Colorado gardens.
Cotoneaster racemiflora soongorica or Sungari Redbead Cotoneaster is a very tough and beautiful shrub, having survived over 40 years of neglect at the closed and unwatered Cheyenne High Plains Horticultural Research Station. It grows 6′-8′ high and wide with arching branches. The dark green leaves that are gray-white underneath, are attractive in themselves, and the flattened clusters of white, Hawthorn-like flowers are some of the showiest of all cotoneasters. They attract bees and other pollinators. Following the flowers are showy red fruits, a quarter of an inch or more in diameter. These berries are not messy and are popular with garden birds. They cluster along the thin branches, appearing as ropes of beads — hence the common name.[Read More]
This tough native xeriscape shrub is seldom given credit for being a broadleaf evergreen, but in the duldrums of dry summer and in the winter, these plants are very useful. I especially like to see it piercing through the white snow in its green, bold, formal, sharp rosette. The stilleto-like leaves are 1’-2 1/2’ long and rosettes increase from the rhizomatous roots. In the garden these off-sets can be cut off with a spade if the plant needs to be kept from spreading. The very sharp leaves are difficult to weed around so I use a dense groundcover around mine (Sedum spurium ‘Bronze Carpet’ makes a nice contrast). This very sharpness which the plant has developed to keep from being browsed to death, can be employed to protect other more delicate plants, like a clump of species tulips, from the deer and rabbits. These yuccas are also useful for traffic management, so best kept a good distance from walks and entryways.[Read More]
