At publication time, no known populations of perennial wild red rice have ever been found in California. Previous populations of perennial wild red rice hybrids in the Sacramento Valley have been eradicated. Seeds fall near the parent plant or disperse to greater distances as rice seed contaminants, with human activities, water, soil movement, and possibly birds. Seeds do not survive ingestion by waterfowl. Seeds are typically dormant at maturity.
Dormancy is partly due to the presence of inhibitors in the seed coat.
Depending on the biotype and environment, seed may remain dormant and viable for up to 3 years or more under field conditions. Many seeds decay during long periods of flooded conditions. Seeds often germinate slightly sooner and at lower temperatures than commercial rice seeds. Planting perennial wild red rice -free certified seed may prevent new introductions of perennial wild red rice . Continuous flooding reduces perennial wild red rice seed survival and attracts ducks that feed on the grains.