Word: calendula
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Dates: during 1960-1969
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...produce other new flower strains, Burpee technicians have used X rays to alter the genes of calendula seeds, created a large double-petaled variety. They have treated seeds with colchicine. a chromosome-multiplying alkaloid that increases a plant's size and changes its characteristics. Colchicine has made possible giant marigolds and snapdragons, and fluffy, ruffled zinnias...
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