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If you check the active ingredients on any commercial bug spray, you'll find chemicals ending in "-thrin"—synthetic compounds that chemical companies created after they realized they couldn't patent the flower those formulas were stolen from. For over a century, gardeners controlled pests with "Persian Powder," made by crushing the dried blooms of the Dalmatian Chrysanthemum. This white daisy contains Pyrethrin, a compound that causes instant paralysis in insects while remaining completely harmless to humans, dogs, and birds. After World War II, the chemical industry engineered synthetic pyrethroids that mimic the effect but don't break down in sunlight—lingering in groundwater and killing beneficial bees. They erased public knowledge of this perennial flower so they could sell you a toxic, patented imitation at a premium. Grow the daisy, dry the flower heads, crush them into powder, and you have an infinite supply of the world's most effective organic insecticide—free.