Yellow Thimbleweed

Anemonastrum richardsonii

Native to:
Aleutian Is., Canada, Greenland, Labrador, Russia, United States
Yellow Thimbleweed

iNaturalist: © jauntingjan (iNaturalist #164290314)

📍 View on iNaturalist →

Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Ranunculaceae
Genus:
Anemonastrum
Species:
Anemonastrum richardsonii
USDA Symbol:
ANRI

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Forb/herb
Height:
30 cm
Light Requirements:
Full Sun
Drought Tolerance:
Low
Bloom Months:
may,jun,jul
Bloom Colors:
white, yellow

Wildlife Benefits

Bees:
★☆☆☆☆ Documented bee visitation (GBIF)

Garden & Ecology Notes

Wildlife Value:
bees, flies

Soil Requirements

Soil Type:
moist, well-drained, organic-rich soil
pH:
5.5 - 7.0 (slightly acidic to neutral)
Drainage:
excellent drainage required
Moisture:
consistently moist
Notes:
prefers cool, shaded environments

Propagation & Germination

Stratification:
Cold/moist stratification required — 60–90 days
Germination Time:
30–60 days
Notes:
Seeds require cold stratification for 60-90 days; sow in fall or after cold treatment.

Pre-treatment: Cold-moist stratification for 30 days at 1–5°C (34–41°F).

Source: Claude AI