The single most ecologically powerful genus in the Intermountain West — native willows top every ecoregion list in the region for caterpillar support. Coyote willow (S. exigua) suits dry streambeds and washes; Scouler’s willow (S. scouleriana) thrives in mountain forests; peachleaf willow (S. amygdaloides) anchors riparian corridors on the plains edge. Between them they cover every habitat zone in the region.

Garden note: Site near seasonal moisture — irrigation channels, drainage swales, low spots. Spreads by root sprouts. Indispensable for any Intermountain habitat garden.

The reigning keystone tree for the southern and central Intermountain West. Gambel oak dominates dry foothills and canyon walls from 4,000–8,500 ft across Utah, Colorado, Arizona, and New Mexico; scrub oak (Q. turbinella) extends coverage into Nevada and the Great Basin. Both grow as large shrubs or small trees, spreading by underground runners into dense, wildlife-rich thickets. Single most wildlife-productive tree you can plant in central Utah.

Garden note: Drought-tolerant once established. Spreads by root sprouts — give it space or plant at property edges. Outstanding fall color. Hardiness zones 3–9.

The second-highest caterpillar host across all three ecoregions and the most versatile plant on this list. Functions as large shrub or small tree; works in moist canyon soils and drier slopes alike. Fragrant white spring flower clusters precede dark purple-black berries that birds descend on in late summer. Found naturally throughout the entire Intermountain West — one of the few keystones suited to every state in the region.

Garden note: Suckers freely — excellent for naturalized areas or habitat edges. One of the easiest high-value natives to establish. Works in full sun to partial shade across a wide elevation range.

Aspens are the iconic tree of the mountain West, growing in clonal colonies across every state in the region. Fremont cottonwood anchors lower-elevation riparian corridors in Utah, Nevada, and Arizona; eastern cottonwood extends into Wyoming and Montana plains edges. Between the three species, the genus Populus covers nearly every habitat zone in the Intermountain West with exceptional ecological productivity.

Garden note: Aspen suits mountain gardens above 6,000 ft; Fremont cottonwood for lower-elevation riparian or irrigated spots. Both spread aggressively by root sprouts — plan for space. The autumn gold display of aspen is unmatched.

The signature pine of the middle-elevation Intermountain West (5,500–8,000 ft), found throughout Utah, Nevada, Idaho, Montana, Wyoming, Colorado, and Arizona. Vanilla-scented bark on mature trees. Provides year-round structure, winter seeds for birds, and nesting cavities. Slow-growing but exceptional long-lived — a genuinely multigenerational tree. Limber pine (P. flexilis) and pinyon pine (P. monophylla, P. edulis) extend the genus’s coverage to higher and lower elevations respectively.

Garden note: Needs well-drained soil and full sun. Not for valley bottoms or heavy clay. Best at elevations matching its natural range. The vanilla-bark smell alone is worth planting it.

Utah and the Intermountain West’s native birch, found along stream banks, canyon bottoms, and riparian corridors throughout the region. Multi-stemmed with attractive reddish-brown bark and graceful catkins. Far better adapted to the region’s soils, alkalinity, and water cycles than European or paper birch, which consistently underperform in the Intermountain West.

Garden note: Prefers moist, well-drained soil. Thrives along irrigation channels, drainage areas, or supplemented beds. Far more reliable in the region than non-native birch cultivars. Multi-stem form is ornamentally excellent.

Rocky Mountain maple (A. glabrum) is the native maple of the mountain West — a large multi-stemmed shrub or small tree common in canyon bottoms and mountain foothills, with outstanding fall color. Box elder (A. negundo) extends maple coverage into lower elevations and riparian corridors throughout the region. Both are far better adapted to Intermountain conditions than ornamental cultivars imported from the East or Japan.

Garden note: Rocky Mountain maple thrives in partial shade and moist soils; excellent understory tree. Box elder adapts to a wide range of soils and conditions. Outstanding fall color without ornamental maple water demands.

The dominant conifer across much of the northern and central Intermountain West above 5,000 ft. A major structural tree in Idaho, Montana, Wyoming, and Colorado forests. Provides critical nesting and roosting habitat, year-round cover for birds, and cone seeds for crossbills and nuthatches. Rocky Mountain Douglas fir (var. glauca) is the Intermountain form — more drought-tolerant and cold-hardy than the coastal variety.

Garden note: Works well as a specimen or screening tree at appropriate elevations. Drought-tolerant once established. Provides year-round wildlife value and outstanding structure in the landscape.

White fir and Rocky Mountain fir (A. bifolia) are the dominant true firs of the central and southern Intermountain West, found throughout Utah, Nevada, Colorado, and Arizona mountain zones. Stately, symmetrical conifers that provide dense year-round cover, nesting habitat for raptors and owls, and seeds for crossbills and chickadees. Exceptionally ornamental — often used as Christmas trees in their natural range.

Garden note: Best at 6,000–9,500 ft in well-drained soil. More drought-tolerant than most true firs. Slow to establish but a beautiful long-term specimen. Tolerates some shade.

The defining plant of the Intermountain West — sagebrush steppe once covered over 250 million acres from British Columbia to Arizona. Big sagebrush (A. tridentata) and its subspecies (basin, mountain, Wyoming) are true keystones: they provide up to 100% of the winter diet of sage grouse, critical cover for pronghorn and mule deer fawns, nesting habitat for sage sparrows and Brewer’s sparrow, and aromatic volatiles that support a specialized community of insects found nowhere else. One of the most ecologically irreplaceable plants in North America.

Garden note: Thrives in well-drained, alkaline soils in full sun — exactly the conditions most Intermountain gardeners have. Drought-tolerant and extraordinarily low maintenance. The silver-gray foliage and aromatic scent are defining features of the region. Plant basin big sagebrush at lower elevations; mountain big sagebrush above 5,000 ft.

The most important shrub for native bees across the entire Intermountain West, appearing on all three ecoregion lists with the highest or near-highest bee specialist counts. Explodes into brilliant yellow bloom in late summer and fall when almost everything else has wound down. Extremely drought-tolerant; thrives in alkaline, poor, disturbed soils that challenge most other plants. The backbone of any pollinator-focused garden in the region.

Garden note: One of the highest-value, lowest-maintenance plants available to any Intermountain gardener. Thrives in poor, alkaline soils. Spectacular late-season interest. Plant in drifts for maximum visual and ecological effect.

Smaller and more refined than rubber rabbitbrush, this species appears on all three ecoregion lists and works well in garden settings while delivering extraordinary value for native bees. Lower, compact habit with narrow grayish-green foliage. Bright yellow flowers in late summer. Thrives in the gravelly, well-drained soils common throughout the region. Complements rabbitbrush beautifully when planted together.

Garden note: A refined, garden-friendly alternative to the larger rabbitbrush. Excellent in xeriscapes, rock gardens, or dry borders across any Intermountain state.

One of the most ornamentally beautiful and ecologically valuable native shrubs in the region. White flowers in early spring — critical early nectar before much else is open. Blue-purple berries in summer that wildlife strip within days of ripening. Excellent fall color. Utah serviceberry (A. utahensis) is the southern Intermountain species; Saskatoon serviceberry (A. alnifolia) extends through Idaho, Montana, Wyoming, and Colorado.

Garden note: The most garden-friendly keystone shrub for the entire region. Adaptable to a wide range of soils; moderate water needs. Works beautifully in a cottage garden alongside roses and perennials. A four-season plant.

Native ceanothus species are remarkably productive caterpillar hosts — supporting 64–100 species depending on ecoregion — and fix nitrogen in the soil at the same time. Snowbrush (C. velutinus) is the common Intermountain species found throughout mountain forests of Idaho, Montana, Wyoming, and Utah, with fragrant white flower clusters in early summer. Martin’s ceanothus (C. martinii) covers the drier southern portions of the region.

Garden note: Excellent medium shrub for full sun to partial shade in well-drained soil. The nitrogen-fixing ability improves surrounding soil. Fragrant white flowers in June are ornamentally excellent. Check for your state’s native species.

Curl-leaf mountain mahogany (C. ledifolius) and true mountain mahogany (C. montanus) are among the most distinctive and ecologically important shrubs of the Intermountain West. Found on dry, rocky ridges and canyon walls throughout the region. The spiraling, feathery seed tails are architectural and beautiful in fall and winter. Critical browse for mule deer and elk in winter when little else is available. Extremely long-lived — plants confirmed over 1,300 years old.

Garden note: Thrives in rocky, alkaline, very well-drained soils in full sun. Extremely drought-tolerant and long-lived. The feathery seed plumes in fall are spectacular. Slow-growing but worth the patience. Truly a plant for generations.

Douglas hawthorn (C. douglasii) and river hawthorn (C. rivularis) are the Intermountain West native species — thorny shrubs or small trees with white spring flowers, dark berries persisting into winter, and exceptional wildlife value. The dense thorny branches provide nesting cover for numerous songbirds; the berries sustain birds through winter when other food is scarce.

Garden note: Excellent four-season shrub with ornamental spring flowers, summer berries, fall color, and winter bird habitat. Works in full sun to partial shade and a wide range of soils. The thorny thickets also provide nesting cover for ground-nesting birds.

Wood’s rose (R. woodsii) is the native rose of the Intermountain West — a fragrant, pink-flowered shrub found throughout the region from sagebrush foothills to mountain forest edges. The red hips persist through winter and are a critical food source for birds during the hardest months. Forms thickets that provide excellent nesting cover. Far more ecologically valuable than any cultivated rose.

Garden note: Spreads by suckers into natural thickets — excellent for habitat edges or naturalized areas. The fragrant pink flowers are genuinely lovely. Can be contained with regular management if needed for a more formal setting.

Utah and Idaho’s native Vaccinium species — low-growing, mat-forming shrubs found in mountain forests and subalpine zones throughout the northern Intermountain West. The berries are intensely flavored and a critical food source for bears, grouse, and birds before winter. Best suited to mountain-area gardens at higher elevations with acidic, moist soil.

Garden note: Requires acidic, well-drained mountain soil and partial shade. Best for gardens at 7,000+ ft. Exceptional ecological and edible value; worth the extra care for mountain-area gardeners.

Wild raspberry (R. idaeus) and thimbleberry (R. parviflorus) are the Intermountain West native Rubus species — found in disturbed areas, forest edges, and riparian zones throughout Idaho, Montana, Wyoming, and Colorado. Produces abundant fruits that nearly every fruit-eating bird in the region depends on. The dense cane thickets also provide nesting cover.

Garden note: Best in moist, partially shaded areas. Spreads aggressively by runners — plant where it can naturalize or manage with a root barrier. The thimbleberry (R. parviflorus) is particularly ornamental with large white flowers and soft leaves.

Native sunflowers top the pollen specialist bee list for every ecoregion in the Intermountain West, supporting more specialist bee species than almost any other flowering plant in the region. Plains sunflower (H. petiolaris) is the dry-adapted species for Utah and Nevada; common sunflower (H. annuus) covers a broader range; Nuttall’s sunflower (H. nuttallii) prefers moist areas. All are undemanding, cheerful, and ecologically extraordinary.

Garden note: Self-seeds freely — let a patch naturalize and it maintains itself. Goldfinches work the seedheads from September through February. One of the most ecologically productive additions to any Intermountain garden.

Native goldenrods appear on all three Intermountain ecoregion lists — remarkable consistency that reflects their genuine importance across the entire region. Blooms late summer into fall when almost nothing else is open, making them a lifeline for migrating monarchs, bees fueling up for winter, and late-season caterpillars. Completely and unfairly blamed for hay fever (ragweed is the culprit — goldenrod pollen is too heavy to be airborne).

Garden note: Spreads by rhizomes — plant where it can naturalize. Excellent back-of-border plant with genuine late-season color. Missouri goldenrod (S. missouriensis) is well-suited to the drier eastern Intermountain areas.

Unassuming and chronically overlooked, but one of the most important plants for native bees across the entire Intermountain West — appearing on all three ecoregion lists with consistently high specialist bee counts. A low, woody-based perennial covered in tiny yellow flowers in late summer. Grows throughout the sagebrush steppe and dry foothills that characterize so much of the region. Extraordinarily drought-tolerant.

Garden note: Perfect for dry, gravelly, or alkaline soils. Best in habitat-style plantings or naturalistic garden edges. A low-care plant of enormous ecological value that most nurseries don't carry — worth seeking out from native plant specialists.

Native asters appear on all three Intermountain ecoregion lists — the autumn workhorses of the cottage garden. Purple and lavender daisy-like flowers from late August into October, bridging the critical gap when summer bloomers have faded. Western aster (S. ascendens) suits dry alkaline soils; Eaton’s aster (S. eatonii) prefers riparian areas; white prairie aster (S. falcatum) covers the plains-edge of Wyoming and Montana.

Garden note: Seek out Intermountain-native Symphyotrichum species rather than eastern cultivars. Western aster (S. ascendens) is the most widely available and best adapted to the region’s dry, alkaline soils.

A low-growing, sprawling perennial with silvery-hairy foliage and bright golden-yellow daisy flowers throughout summer and into fall. Native to dry, rocky slopes throughout the Intermountain West. Appears on all three ecoregion lists with consistently high specialist bee counts — extraordinarily productive for a plant most gardeners have never heard of.

Garden note: Thrives in poor, dry, rocky soils in full sun — perfect for slopes, rock gardens, or areas where conventional plants struggle. Low-care, high-value, and genuinely beautiful in bloom.

Bright yellow daisy flowers with distinctive sticky, curled bracts — a native of roadsides and disturbed ground throughout the region. Appears on all three ecoregion lists. Exceptional for native bees, supporting 68–75 specialist species. Blooms midsummer into fall, overlapping with goldenrod and aster to create a continuous late-season nectar corridor across the entire Intermountain West.

Garden note: Thrives in alkaline, dry, disturbed soil — exactly what most Intermountain gardeners have. Short-lived perennial that self-seeds freely. Plant in naturalistic areas or habitat beds. The sticky, curled bracts are a conversation piece.

The cheerful native coneflower of the eastern Intermountain fringe — present across Wyoming, Montana, Colorado, and Idaho. Bright golden-yellow daisy flowers with dark centers from early summer through fall. A prolific self-seeder that naturalizes beautifully in open meadow areas. Less drought-tolerant than many other keystones on this list but more widely available from mainstream nurseries.

Garden note: Best in moderate soil moisture and full sun. Excellent for meadow-style plantings or cottage garden borders in the wetter eastern portions of the Intermountain region. Self-seeds freely into reliable naturalistic drifts.

Native fleabanes are the low-growing daisy relatives found on rocky slopes, gravelly ridges, and disturbed soils throughout the Intermountain West. Cutleaf daisy (E. compositus) is the high-elevation species; shortray fleabane (E. lonchophyllus) covers lower elevations. Both are exceptional for native bees in the spring and early summer, filling an important early-season nectar gap before larger composites bloom.

Garden note: Perfect for rock gardens, gravel mulch areas, or naturalistic slopes. Very low water requirements once established. Fills the early-season nectar gap when little else is blooming.

Silvery lupine (L. argenteus) is the common native lupine across the Intermountain West — found in sagebrush hills, open forests, and mountain meadows throughout the region. Large-leaved lupine (L. polyphyllus) covers wetter mountain areas. Both fix nitrogen in the soil like their legume relatives, improving surrounding plant communities, and support a range of specialist insects including several blue butterfly caterpillars that can feed on lupine alone.

Garden note: Beautiful tall perennials with spectacular spike flowers in blue, purple, and lavender. Best in full sun and well-drained soil. Nitrogen-fixing — improves surrounding soil. Self-seeds freely into naturalistic drifts.

The Intermountain West has more native Penstemon species than almost anywhere on earth — over 60 species across the region, adapted to every soil type and elevation from desert to alpine. Rocky Mountain penstemon (P. strictus) is the most widely available; firecracker penstemon (P. eatonii) is essential for hummingbirds; Palmer’s penstemon (P. palmeri) is fragrant and spectacular. Each species supports a distinct community of specialist pollinators.

Garden note: Among the most ornamentally spectacular and region-appropriate perennials available. Choose species native to your specific elevation and state. Drought-tolerant once established. Plant a succession of species for continuous bloom from April through August.

The brilliant orange-red flowers of native globemallow are one of the most cheerful sights in dry Intermountain landscapes from spring through midsummer. Multiple species cover the region: scarlet globemallow (S. coccinea) across the plains and foothills, gooseberry-leaf globemallow (S. grossulariifolia) in the Great Basin, and Munro’s globemallow (S. munroana) across the northern Intermountain West. Certain Diadasia bees can only collect pollen from Sphaeralcea — without globemallow, those bees cannot survive.

Garden note: One of the most reliable, beautiful, and low-maintenance natives for dry sunny gardens across the entire region. Spreads slowly into natural-looking drifts. The orange blooms are stunning against Utah’s red rock or Nevada’s tan soil.

A cheerful, low-growing perennial blanketed in bright yellow daisy flowers for months. Woolly silver foliage. Native to the desert Southwest; works across the warmer, lower-elevation parts of Utah, Nevada, Arizona, and New Mexico. One of the longest-blooming natives in the region, providing nectar into late fall. Exceptional for specialist bees in the southern Intermountain zone.

Garden note: Best in hot, dry, sunny locations with poor to average soil. Excellent for south-facing slopes or areas that bake in summer. Very low water. Plant in southern Utah, Nevada, and Arizona sections of the region.

A low-growing annual or short-lived perennial with finely cut, fern-like foliage and large purple daisy flowers with bright yellow centers. Native to dry plains and disturbed soils of the Great Basin, Colorado Plateau, and plains edge. Blooms from early summer through fall and self-seeds freely, naturalizing beautifully in open areas. An underused native with surprising specialist bee value.

Garden note: Allow to self-seed for a naturalistic drift effect. Excellent for filling dry, open ground between larger shrubs. Showy in mass and requires almost no care in appropriate conditions.

Utah has more native Astragalus species than almost any other state, and the genus extends throughout the Intermountain West with dozens of regional species. Low-growing native legumes with silvery-hairy foliage and pink-purple pea flowers in spring. They fix nitrogen in the soil and are host plants for specialist bees that cannot gather pollen from any other genus. Early spring bloomers critical to emerging native bees before much else is open.

Garden note: Many Astragalus species are low-growing and suitable as groundcover in dry, sunny areas. Seek locally-sourced regional species from native plant nurseries. Exceptional for early-spring native bees.

Native prairie clovers are low-growing, nitrogen-fixing legumes with slender foliage and dense spikes of purple or white flowers in summer. Found across the plains edge and sagebrush foothills of the eastern Intermountain West. Exceptional for specialist bees and as larval hosts for several blue and sulphur butterflies. Western prairie clover (D. ornata) is the Intermountain-specific species.

Garden note: Low-growing and suitable for dry, sunny garden beds or groundcover in naturalistic areas. Nitrogen-fixing — improves surrounding soil. Works well in combination with native grasses for a prairie-edge planting.

Showy daisy (E. speciosus) is one of the most ornamentally attractive native groundcover-height plants in the Intermountain West — large lavender to purple daisy flowers from June through August on plants 12–24 inches tall. Found throughout mountain forests and open areas across the region. More garden-friendly than many fleabane species and reliably beautiful in bloom.

Garden note: One of the best native groundcover-height plants for cottage garden borders in the mountain West. Works in full sun to partial shade in well-drained soil. Excellent in rock gardens, front-of-border, or naturalistic settings.

The dominant bunchgrass of the northern Intermountain West sagebrush steppe — native to Idaho, Montana, Wyoming, Oregon, and Nevada. Forms dense, blue-green bunches that provide critical nesting structure for ground-nesting birds and cover for small mammals. The seeds are a primary food source for sparrows and finches throughout the year. Extremely drought-tolerant and an important component of native plant community restoration.

Garden note: Excellent ornamental bunchgrass for naturalistic gardens throughout the northern Intermountain West. Blue-green color is distinctive; golden in fall. Use as groundcover in naturalistic areas or as accent plants in dry borders.

The defining grass of the shortgrass prairie and Colorado Plateau, native across Wyoming, Colorado, Utah, Nevada, and New Mexico. Distinctive eyelash-shaped seed heads on curved stalks are immediately recognizable and architecturally beautiful. Extremely drought-tolerant; one of the most water-efficient lawn alternatives available in the eastern Intermountain states. Seeds are a critical food source for native sparrows and finches in fall and winter.

Garden note: Can be used as a lawn substitute in the drier, lower-elevation parts of the region. Extremely low water once established. The curved eyelash seedheads are architecturally distinctive and ornamentally underrated.

One of the most widespread native grasses of the Great Basin and Intermountain West, found in virtually every plant community from sagebrush flats to mountain meadows. Among the first plants to green up in spring, providing critical early-season forage before other plants emerge. Short and fine-textured, it provides nesting cover for ground-nesting birds and seeds for small sparrows throughout the year.

Garden note: Excellent filler in naturalistic native plant gardens throughout the Great Basin. Green in spring, dormant in summer heat — works beautifully planted among sagebrush, rabbitbrush, and globemallow.

A native sod-forming grass that creates dense, blue-green groundcover across the plains edge and foothills of the eastern Intermountain West. One of the most important grasses for grazing wildlife; pronghorn rely heavily on it in early spring when it greens up before most other vegetation. Provides dense nesting cover for ground-nesting birds throughout the region.

Garden note: Best for naturalistic meadow-style plantings in the drier, lower-elevation eastern portions of the region. Forms a dense sod that can serve as a low-maintenance lawn alternative in appropriate areas.