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The most commonly available pyrethrum-based insecticides contain extracts from the flowers called pyrethrins. The advantage in the vegetable garden is that a pyrethrin insecticide is effective against a wide variety of hard-to-kill insects like aphids, beetles, leafhoppers, and certain caterpillars.he source of pyrethrum is the flowers of Chrysanthemum cinerariaefolium, also called the Dalmation flower. Photo: Pam Peirce. The source of pyrethrum is the flowers of Chrysanthemum cinerariaefolium, also called the Dalmation flower.
1 It looks more like the common daisy than other pyrethrums do. 2  Its flowers, typically white with yellow centers, grow from numerous fairly rigid stems. 3  Plants have blue-green leaves and grow to 45 to 100 cm in height.4  The plant is economically important as a natural source of insecticide. C. coccineum, the Persian chrysanthemum, is a perennial plant native to Caucasus and looks somewhat like a daisy. 2  It produces large white, pink or red flowers. 3  The leaves resemble those of ferns, and the plant grows to between 30 and 60 cm in height.