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Native Plant Gardens
Gallery and Growing Tips

 

Trees & Shrubs


SMALL/MEDIUM SHRUBS

Common Name Latin Name (Weber) Height (Feet) Preferred Environment Comments and Tips
Antelope bitterbush Purshia tridentata 5 South-facing slopes, dry well-drained soils Attractive, birds eat seeds
Boulder raspberry
Photo - Boulder Raspberry
Oreobatus (Rubus) deliciosus 5 Dry but perfers moist / Partial shade Very attractive huge white flowers; wildlife will eat the fruits which aren't very tasty to people.
Buckbrush Ceanothus fendleri 2 Dry / Sun to partial shade
Spiny
Common juniper
Photo - Common Juniper shrub
Juniperus communis ssp. alpina 3 Dry or moist / Shade
Attractive, broad evergreen shrub that grows low to the ground. Requires shade and moisture.
False indigo Photo - false indigo Amorpha fruticosa 6 Dry / Sun A small native shrub which is listed as a state species of special concern. Leaves are late to appear in spring; the purple flower stalks produce a very sweet, fragrant aroma.
Four-winged saltbush
Photo - Four-winged Saltbush
Atriplex canescens 5 Very Dry / Sun
Seeds eaten by birds.
Golden currant
Photo - Golden Currant
Ribes aureum 6 Dry to moist / Partial shade This bush greens up quickly in spring and produces scores of delicate golden-yellow flowers. The flowers sometimes have a clove scent. In late summer, small greenish-golden fruits feed wildlife. Deer will browse foliage. Readily available at nurseries.
Kinnikinnick Photo - Kinnikinnick in flower Arctostaphylos uva-ursi 1 Semi-dry areas; needs acidic, well-drained soil/ Shade
Attractive, waxy leaves and red berries; ground cover. Browsed by a wide variety of wildlife. Occasionally found at nurseries.
Ninebark
Photo - ninebark
Physocarpus monogynus 4 Dry to moist / Shade Very attractive, showy flowers; birds eat seeds

Oceanspray (Rock spirea)

Photo - Oceanspray shrub

Holodiscus dumosus 10 Dry but prefers moisture / Sun or partial shade

A lovely drought-tolerant shrub that produces spires of creamy white flowers in late spring or early summer. Often available in nurseries.

Oregon holly-grape (Creeping mahonia)Photo - Oregon Holly Grape Mahonia repens 1 Dry / Sun but prefers shade

Holly-like leaves; attractive ground cover or small shrub. Yellow sweet-scented flowers appear very early in spring; birds eat the sour grape-like fruits. Will grow from seed, transplants easily and may be started from root stocks. Plants take several years to mature and bloom.

Careful! Beware non-native look-alikes

Several much taller non native Mahonias are commonly sold in local nurseries - Mahonia aquifolium (tall grape holly) and M. bealii (leatherleaf mahonia). Be sure to ask for M. repens.

 

Rabbitbrush, Chamisa Photo - Rabbitbrush in flower Chrysothamnus nauseosus 1-6 Hot Dry /Sun

A very attractive drought tolerant shrub which produces masses of greenish-gray foliage. It will grow in the driest, hottest part of your yard. Yellow flowers in late summer attract clouds of butterflies. If the plant becomes straggly or overgrown, give it a severe haircut. You will be amazed how quickly it recovers and fills out!

Rabbitbrush - dwarf blue Chrysothamnus nauseosus ssp. nauseosus 1-4 Hot Dry / Sun A smaller local variety of the Rabbitbrush listed above. 1-4 feet tall at maturity
Shrubby cinquefoil Photo - shrubby cinquefoil Pentaphylloides floribunda (Potentilla fruticosa) 3 Dry / Sun or partial shade
Often cultivated as an ornamental; attractive. Many cultivars are available at nurseries.

Snowberry
Photo - Wood's wild rose

Symphoricarpos albus 3 Dry / Shade Attractive red stems and white fleshy berries. This plant grows and transplants easily and needs no care, it will thrive in shady dry places where nothing else seems to grow. 

Virginia Creeper

Photo - wax currant

Parthenocissus quinquefolia 20 - 30 Part sun, Dry / Moist

A very hardy climbing vine that adheres to walls and fences with small sticky pads. The tiny pale green flowers become dark purple berries that are food for birds but mildly toxic to humans. In fall, the foliage turns a spectacular crimson. It may cover and shade out other plants if not pruned occasionally.

Virginia creeper is used to shade and cool buildings in summer - the sticky pads do not penetrate masonary, but adhere to the surface. Trying to rip the plant from a wall may damage the surface; but if the plant is first killed, by severing the vine from the root, the adhesive pads will eventually deteriorate and release their grip.

Wax currant
Photo - wax currant
Ribes cereum 4 Dry / Partial shade
Not spiny; wildlife eat the fruits, which are related to gooseberries. 
Waxflower (Cliffrose)Photo - waxflower Jamesia americana 6 Sun / dry Because it naturally grows on cliffs, it makes a fine medium-szied shrub for rock gardens. Aromatic, with attractive white flowers in spring.

Western virgin's bower 

Photo - Western virgin's bower



Clematis ligusticifolia creeping vine Sun or shade / Dry A very hardy climbing vine for dry areas, tolerates clay soils. In late summer vines produce clusters of  small, delicate white flowers. Female plants then produce masses of feathery seeds. Starts from seed and transplants fairly easily.Can be trained to climb a trellis.

Wild grape

Photo - wild grape vine

Vitis riparia creeping vine Part sun, Dry / Moist A hardy but slow-growing climbing vine that produces fruit for wildlife. Starts easily from seed and can be trained up a trellis to form a shaded arbor. Grape leaves are host plants for several attactive local moths.
Wild rose or Wood's rose Photo - Wood's wild rose Rosa woodsii 1-6 Dry / Sun but prefers moist partial shade

Wildlife feed on the red rose hips, which are an excellent source of Vitamin C. Some find it aggressive in gardens.

Stems are often covered with small sharp torns, more an annoyance than a hazard.

Winterfat
Photo - Winterfat
Kraschenin-nikovia (Ceratoides) lanata 1-3 Dry / Sun, Sandy alkaline soils Flower clusters become fluffy resembling lambs' tails.
Yucca, Plains yucca Photo - Yucca in flower Yucca glauca 3 Hot Dry / Sun
A very hardy, drought tolerant prairie plant that starts easily from seed and transplants easily when small. The seedlings seem to require shade and moisture for the first few years. Its sharp foliage may injure a careless gardener. The spectacular stalks of white flowers won't appear until the plant is several years old. Yuccas will grow best in the hottest driest parts of your yard.


LARGE SHRUBS/SMALL TREES

Boxelder Negundo aceroides (Acer negundo) 20 Stream banks Leaves yellow in fall
Chokecherry Photo - Chokecherry Fruits Padus (Prunus) virginiana ssp. melanocarpa 12 Dry / Sun but prefers moist partial shade
In spring, this bush displays sprays of tiny white scented flowers that attract bees and butterflies. The sour astringent purple fruits are a favorite of wildlife and can be boiled down to make fine pancake syrup and jam (with sugar added!). Chokecherries may spread aggressively underground through suckers and may require space and pruning. Deer may browse the foliage. Chokecherries will sprout readily from seeds but take several years to reach maturity. Transplant easily.

Hackberry

Photo - Hackberry tree

Celtis reticulata 12 Dry rocky hillsides and ravine banks A small tree of the plains. Small reddish-brown fruits eaten by birds.  The leaves turn golden-yellow in fall.
Hawthorn Photo - Hawthorne in flower Crataegus erythropoda 10 Dry / Sun
Beautiful white flowers in spring, like miniature white roses. Fruits are  berries like rose hips, red and woody, but are eaten by some animals. Beware the thorns, up to 2" long, shiny red. Thornless variety may be available in the nursery trade.
Mountain-ash
Photo - mountain ash berries
Sorbus scopulina 12 Rocky canyons and ravines

Orange berries produced in fall are said to appeal to wildlife, although this doesn't seem to be the case in Boulder. Deer may aggressively browse the leaves.

Careful! Beware non-native look-alikesMost nurseries stock the European mountain ash, Sorbus aucuparia. Check the name carefully!

Mountain mahogany Photo - Branch of Mountain mahogany Cercocarpus montanus 15 Open rocky woods and stony soils A drought-tolerant attractive shrub. Seeds have long furry "mouse tails" attached. Leaves turn yellowish in fall, but the plant is sometimes evergreen. Deer may browse the leaves.Often available in nurseries.
Rocky Mountain juniper Photo - Rocky Mountain juniper Sabina (Juniperus) scopulorum 15-40 Dry / Sun
A hardy drought-tolerant tree that can thrive in full hot sun. Birds eat the fruits.
Rocky Mountain maple
Photo - Rocky Mountain Maple
Acer glabrum 15 Moist / Shade
More of a large, loose bush than a tree. Attractive red stems. Birds eat seeds, buds, and flowers. Attractive fall colors.
Serviceberry
Photo - Service Berry
Amelanchier alnifolia 15 Dry but prefers moist / Shade
An attractive tall shrub which produces white flowers in spring. Fruits eaten by wildlife (and people!). Transplants easily. Varieties and cultivars are readily found in nurseries. Seedlings may volunteer.
Silver buffaloberry Shepherdia argentea 12 Streamsides and river bottoms Leaves silvery on both sides; branches spiny. Native cousin of the noxious Russian Olive.
Sumac, smooth
Photo - smooth sumac in flower
Rhus glabra 5 Dry / Sun Slopes and canyonsides

This is a medium sized shrub that grows in patches and clumps. Leaves appear late in spring and turn a spectacular crimson in autumn.


 

Careful! Beware non-native look-alikesAVOID the similar but much larger and more agressive staghorn sumac (R. typhina) - our native doesn't have velvety branches.

Sumac, Three-leaf (Skunkbush) Photo - Skunkbush Rhus aromatica ssp. trilobata 5 Dry / Sun Don't be put off by this shrub's name! It is a drought-tolerant gem. Wildlife eats the dry red-yellow fruits, which taste like dill pickles. Leaves appear late in spring but last into the fall, when they turn lovely shades of yellow, red and orange. Trivia: American Indians prepared a sour lemonade-like drink from the berries. Commonly available at nurseries.
Thinleaf alder Alnus incana ssp. tenuifolia 18 Swampy ground or sandy soil; montane stream banks and pond borders Female catkins are cone-like and persist through winter
Wild plum
Photo - wild plums
Prunus americana 12 Dry or moist / Sun These shrubs produce aromatic displays of white flowers each spring. They often form thickets; 1" yellow to red fruits are edible. They will start from seed but take some years to reach maturity. They are somewhat delicate to transplant.


LARGE TREES

Lanceleaf cottonwood Populus x. acuminata 40 - 60 Stream banks and valleys First generation sterile hybrid between P. deltoides and P. angustifolia; leaf-shape is indicative of this cross.
Narrowleaf cottonwood Populus angustifolia 30 - 60 Stream banks and valleys Long narrow willow-like leaves turn yellow in fall. Available as a graft onto P. x acuminata rootstock which should reduce suckering.
Plains cottonwood
Photo - Plains cottonwood in autumn
Populus deltoides ssp. monilifera 60 - 80+ Moist soils; floodplains, riparian areas and valley bottoms Nursery stock should be male and therefore "cottonless"; broad leaves turn yellow-gold in fall.This tree will grow very quickly.
Ponderosa pine
Photo - Ponderosa pine
Pinus ponderosa  60 - 80+ Variety of habitats - adaptable Tall evergreen tree grows to more than 80 feet, and can live for several hundred years. Seeds are eaten by birds and small mammals. It will grow well in dry, sunny locations. Be careful not to over-water it!