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Pyrethrum is a name for a group of daisy-like perennial plants from the Asteraceae family, now mostly placed in Tanacetum or Chrysanthemum; commonly grown members are Tanacetum coccineum (Persian pyrethrum) and T. cinerariifolium, which is grown for its natural insecticide. Give them full sun, well-drained soil and moderate water.
Pyrethrum was a genus of several Old World plants now classified in either Chrysanthemum or Tanacetum which are cultivated as ornamentals for their showy flower heads. Pyrethrum continues to be used as a common name for plants formerly included in the genus Pyrethrum. Pyrethrum is also the name of a natural insecticide made from the dried flower heads of Chrysanthemum cinerariifolium and Chrysanthemum coccineum. The insecticidal compounds present in these species are pyrethrins.
Text excerpted from the Wikipedia article Pyrethrum 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.
