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Slender goldenbanner

Thermopsis gracilis

Also called Slender Golden Banner

Slender goldenbanner
Photo: DeanWmTaylor, CC BY 2.0

Slender goldenbanner is a rhizomatous perennial wildflower native to the western United States, with upright hollow stems and spikes of bright yellow pea-like flowers. It is grown mainly as a native garden plant in cool, dry, sunny sites.

Family
Fabaceae (Pea & bean family)
Grows as
Perennial
Light
Full sun, Part shade
Water
Water deeply when the soil is dry, then let it drain; established plants need little extra water.
Soil
Well-drained, sandy or gravelly soil; tolerates poor soil.
Temperature
Hardy in cool temperate climates; tolerates cold winters, and summer heat if drainage is good.
How easy
Moderate
Safety
Toxic: Seeds and other parts contain quinolizidine alkaloids such as cytisine, which can cause nausea, vomiting and more serious poisoning if eaten.
Native range
Oregon to N. California
Climate
temperate

About

Thermopsis gracilis is a species of flowering plant in the legume family known by the common name slender goldenbanner.

It is native to the western United States from Washington state to northern California.

Other Thermopsis plants

California goldenbanner · Lanceleaf Thermopsis · Santa Inez goldenbanner · Allegheny Mountain goldenbanner · Mountain goldenbanner · Prairie thermopsis · Showy goldenbanner · Aaron's rod · Goldenbanner

Text excerpted from the Wikipedia article Thermopsis gracilis by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.

The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.

Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.

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