PlantFun
Plant Needs
Sunlight
Requires full sun to partial sun; thrives in open prairie or meadow conditions with minimal shade.
Watering
Drought-tolerant; water only during prolonged dry spells to avoid root rot in well-drained soil.
Temperature
Cold-hardy to subarctic temperatures; tolerates extreme winter cold and warm summer days without heat stress.
Characteristics
- Leaf: Pinnately compound leaves with small, narrow leaflets covered in fine silvery hairs.
- Flower: Dense spikes of pea-like purple to pale lavender blooms with a curved keel.
- Stem: Erect, slender stems with sparse silvery pubescence.
Care Guide
Watering
Water sparingly during active growth; allow soil to dry completely between waterings
Fertilization
Apply diluted, low-nitrogen feed once at the start of active growth. Use only diluted, organic feeds to avoid disrupting the plant's adapted nutrient needs.
Eggshell powder top-dress：Crush clean, dried eggshells into fine powder; sprinkle lightly on the soil surface once every 3 months to boost soil calcium content without burning delicate roots.Pruning
- Deadhead spent flower spikes to prevent unwanted self-seeding in managed landscapes.
- Trim back dead, brown foliage in late autumn to tidy clumps and reduce overwintering pest habitat.
- Remove damaged or diseased stems at the base in early spring to promote healthy new growth.
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: Contains swainsonine; ingestion can lead to incoordination, weight loss, and neurological damage with repeated exposure.
Humans: Contains swainsonine; prolonged or large ingestion may cause gastrointestinal distress and neurological impairment.
Garden Uses & Culture
Culture: N/A
Usage: Ecological host plant for native bee species; provides forage in prairie ecosystems.
