If you want to know what do broccoli seeds look like, you can try it in your garden next time you plant broccoli and see the results. If you allow your broccoli plant to mature past the time of harvesting its head, the blooms will open and potentially be pollinated, resulting in seed production. Collect, store these seeds to plant them over several growing seasons in the future. Saving seeds from your garden is a wise choice that has many advantages.