Purshia tridentata (Antelope bitterbrush)
Moderate to deeply taprooted evergreen shrub 2-10 ft. tall with small yellowish flowers, blooming April to August. Adapted to a wide variety of well-drained soils, slightly acidic to basic, often deep, coarse profiles on dry slopes and hillsides within mixed shrub and woodland forest communities; up to 11,000 ft. elevation. Less drought tolerant than close relative Desert bitterbrush (P. tridentata var. glandulosa). Establishes by seed and layering, when branches take root after soil contact; some ecotypes may sprout. Mostly killed by wildfire. Occasionally able to produce nitrogen-fixing root nodules. Used for restoration, erosion control and mine reclamation. Moderately palatable to livestock and highly palatable to pronghorn, deer, elk and bighorn sheep. Caterpillar host plant for Behr’s hairstreak butterfly and numerous moths, including Columbia silkmoth, Western sheepmoth, Walnut spanworm moth and Nuttall’s sheepmoth.
DISTRIBUTION / ADAPTATION
INFORMATION & ATTRIBUTES
Family: Rosaceae
Duration: Perennial
Growth Habit: Shrub
Native Status: Native
Growth Form: Multiple stem
Mature Height: 15 ft.
Bloom Color: White
Fruit/Seed Color: Brown
Bloom Period: Early spring
Annual Precipitation: 8-20 in.
Drought Tolerance: High
Shade Tolerance: Intermediate
Elevation: up to 10,000 ft.
Fire Resistance: No
Fire Tolerance: None
Nitrogen fixation: Low
SOIL ADAPTATION
Coarse Texture: Yes
Medium Texture: Yes
Fine Texture: No
Salinity Tolerance: None
CaCO3 Tolerance: High
pH Range: 5.6-8.4
SEEDING NOTES
Seeds per Pound: 17,100
Seeding Rate: 1-3 PLS lbs/acre
Season: Fall
Days to Germination:
VARIETIES & LOCAL ACCESSIONS
None