Male plants grow sacs within the crevices of stems which are filled with pollen. Preference cookies. Weed seedbank and community shifts in a long-term cropping systems experiment.  Source: <a href=https://my.cbn.com/pg/groups/17543606/bulk-weed-seeds-for-sale-perfect-for-commercial-growers/>https://my.cbn.com/pg/groups/17543606/bulk-weed-seeds-for-sale-perfect-for-commercial-growers/</a>