GM sunflower. Conceptual image representing the genetic modification of plants, showing one red sunflower growing in a field of normal sunflowers (Helianthus sp.). Genetic modification of plants is done to give them desirable characteristics, for instance increased yields, or resistance to frost or parasites. There are fears that GM plants could interbreed with their normal counterparts and permanently alter the wild population. Sunflowers are grown for their seeds and their oil, and also for sale as decorative plants.