How To Collect Basil Seeds From Plant Posted on May 27, 2022 By Amy Kaplan No Comments on How To Collect Basil Seeds From Plant FAQ How To Harvest Basil Seeds Allow your basil to flower and go to seed. This requires no effort, just continue to water it and be patient. Wait Once the basil flowers, you need to wait around 4-6 weeks for the flowers to go brown. Pick the Dried Flowers. Once your flowers have dried up, you will be left with the remnants which include the seed pods. Get the Seeds. Initially the picked bits don't look like anything much. Gently tear open the dried up pieces over a separate dish to catch them.