Sulphur cosmos is a bright annual daisy with yellow, orange or red flowers, grown from seed. It needs full sun and little water once established, and it often self-sows for several years.
Family
Asteraceae (Daisy family)
Grows as
Annual
Light
Full sun, Part shade
Water
Water regularly until established, then water sparingly as the plant is drought tolerant.
Soil
Well-drained soil, tolerant of poor and alkaline soil (pH 6.0 to 8.5).
Temperature
Warm conditions; germinates best around 24 °C; half-hardy and killed by frost.
How easy
Easy
Safety
Not known to be toxic
Native range
Mexico to C. America
Climate
seasonally dry tropical
About
Cosmos sulphureus is a species of flowering plant in the sunflower family Asteraceae, also known as sulfur cosmos and yellow cosmos. It is native to Mexico, Central America, and northern South America, and naturalized in other parts of North and South America as well as in Europe, Asia, and Australia. It was introduced into Asia from Mexico via the Manila-Acapulco galleon trade.
This plant was declared invasive by the United States Southeast Exotic Pest Plant Council in 1996. The flowers of all Cosmos attract birds and butterflies, including the monarch butterfly.
How to grow it
Growth characteristics of this plant include:
Germination takes between 7 and 21 days at the optimal temperature of 75 degrees Fahrenheit; flowering begins between 50 and 60 days after germination
Uses
The Sundanese of west Java in Indonesia eat its young shoots raw or cooked as a kind of lalab.
Text excerpted from the Wikipedia article Cosmos sulphureus 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.