Answer: pyrethrum

AnswerCrossword Clue
pyrethrumany of several chrysanthemums, as Chrysanthemum coccineum, having finely divided leaves and showy red, pink, lilac, or white flowers, cultivated as an ornamental
pyrethruma name still applied to various garden flowers, esp varieties of Chrysanthemum
pyrethrumany of several chrysanthemums, as C. cinerariifolium, or C. coccineum, cultivated as a source of insecticides
pyrethrumthe dried flower heads of these plants, used chiefly as an insecticide and sometimes in medicine for certain skin disorders