Now, some of the mustard in our front yard is going to seed. To thrive in their nitch as a weed they, of course, have lots of seeds. Seeds are 1.0 mm by 0.5 mm. The cylindrical seed pods are about 4 cm long and about 0.8 mm in diameter. In the plant I picked, seed pods extend 20 cm below the initial flower every 8 mm or so. The flower has petals and male parts that look like pollen sacks. Since the plants are in seed, the pollen must have been released weeks ago.