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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.
In fact, the name safflower may be derived from another plant, saffron (Crocus sativus), which was a precious and very expensive yellowish dye obtained from the stigmas of freshly opened flowers. The name Carthamus is the latinized form of the Arabic word quartum or gurtum, which refers to the pigment color.n fact, the name safflower may be derived from another plant, saffron (Crocus sativus), which was a precious and very expensive yellowish dye obtained from the stigmas of freshly opened flowers. The name Carthamus is the latinized form of the Arabic word quartum or gurtum, which refers to the pigment color.