Dandelions are successful weeds in part because of their adaptations for using rainfall optimally. The long, jagged leaves of the dandelion rise directly above the taproot, forming a rosette that lies closely to the ground. Its grooved leaves conduct rainwater toward the center of the rosette, keeping the taproot well watered. When eaten by an herbivore, such as a deer or grasshopper, or mowed, the dandelion is able to regrow from the residue of its long taproot. Even a part of the root can result in new dandelions that spread rapidly with their feathery, wind-borne seeds.