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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.
The Willow-herbs (Epilobium), nine species of which are natives of Great Britain, belong to the order Onagraceae, to which belong also the familiar garden flowers the Fuchsia, Clarkia and Godetia, and the Evening Primrose (Cenothera biennis) (a native of North America, which, as a garden escape, is sometimes found apparently wild).