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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.
Pyrethrins are nature's way of lending gardeners a helping hand when it comes to controlling pests. A group of six chemicals, pyrethrins come from the flowers of the pyrethrum or Dalmatian daisy (Chrysanthemum cinerariaefolium), which is hardy in U.S. Department of Agriculture plant hardiness zone 10.Related substances are pyrethrum, which is a mixture of pyrethrins, and pyrethroids, man-made versions of pyrethrins.ried pyrethrum daisy petals provide pyrethrins, or the chemicals are extracted using solvents. The pyrethrum daisy grows in Ecuador, Kenya, Rwanda and Tanzania. After the newly opened flowers are harvested, they're dried and crushed into a powder or soaked in solvent to dissolve the pyrethrin-rich oil.