Examples of Weed Seed Production Per Plant
Learn about the “weed seed bank” and how the “never let ’em seed” rule can help maintain a weed-free garden.
By Robert Norris, Ph.D., Fellow of the Weed Science Society of America
Most people don’t realize that a weed can produce literally thousands — or even millions — of seeds per plant. The chart shows the number of seeds coming from single weed plants. Learn more about the “weed seed bank” in Never Let ’Em Seed.
|Weed Name||Weeds Per Plant||Where the Plant Was Located|
|Barnyardgrass, Echinochloa crus-galli||750,000||Davis, CA|
|Purslane, Portulaca oleracea||> 2,000,000||Davis, CA|
|Black nightshade, Solanum ptycanthum||>800,000||Rosemount, MN|
|Puncturevine, Tribulus terrestris||>100,000||Pullman, WA|
|Powell amaranth, Amaranthus powellii||268,000||Freeville, NY|
|Shepherd’s purse, Capsella bursa-pastoris||40,000||Sheffield, UK|
|Chickweed, Stellaria media||25,000||Rothamsted, UK|
Data collected by various researchers around the globe.