Weed seeds are a part of the marijuana plant. They are the tiny, soft fruits that develop on the plant after the flowers are pollinated. The seeds are made up of three parts: the embryo, the endosperm, and the seed coat. The embryo is the plant itself, and the endosperm and seed coat are the support structure for the plant. What are Weed Seeds? https://weedseedszilla.com The weed seeds are the tiny, soft fruits that develop on the plant after the flowers are pollinated. The seeds are made up of three parts: the embryo, the endosperm, and the seed coat.