The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
intransitive verb self-sows, self-sown, self-sow·ing
To reproduce or spread by natural dispersion of seed: a plant that self-sows readily.