Tropidocarpum californicum, known as king's gold, is a small annual herb in the cabbage family, native to a tiny area of the southern San Joaquin Valley in California. It is a rare, wild species rather than a common garden plant, so it is grown mainly by native plant enthusiasts from seed.
Family
Brassicaceae (Cabbage family)
Grows as
Annual
Light
Full sun
Water
Water sparingly during germination and early growth, then let it rely on winter and spring rain; avoid soggy soil.
Soil
Well-drained, sandy or loamy soil; desert-type soils suit it.
Temperature
Tolerates mild to warm conditions; protect from hard frost.
How easy
Moderate
Native range
California (San Joaquin Valley)
Climate
subtropical
About
Tropidocarpum californicum, the king's gold, is a plant species endemic to a small region in California. It is known from only Kern and King counties in the southern part of the San Joaquin Valley.
Tropidocarpum californicum is an ascending or decumbent herb up to 25 cm tall. Leaves are up to 6 cm long, getting smaller the further up the stem. Flowers are yellow. fruits triangular.
Text excerpted from the Wikipedia article Tropidocarpum californicum 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.