Blackroot
Pterocaulonvirgatum

Family: Asteraceae (ass-ter-AY-see-ee)
Genus: Pterocaulon (ter-oh-KAW-lon)
Species: virgatum (vir-GA-tum)

Synonym:Pterocaulon pycnostachyum

Category
Perennials

Water Requirements
Drought-tolerant; suitable for xeriscaping

Sun Exposure
Sun to Partial Shade

Foliage
Evergreen
Herbaceous
Succulent

Foliage Color
Bronze

Height
18-24 in. (45-60 cm)

Spacing
18-24 in. (45-60 cm)

Hardiness
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
USDA Zone 10a: to -1.1 °C (30 °F)
USDA Zone 10b: to 1.7 °C (35 °F)
USDA Zone 11: above 4.5 °C (40 °F)

Where to Grow

Danger

Bloom Color
Pale Pink
White/Near White

Bloom Characteristics

Bloom Size

Bloom Time
Mid Spring
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall

Other details

Soil pH requirements
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information
Non-patented

Propagation Methods
From seed; sow indoors before last frost
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting