BRASSICA Growing Brassica Plants for Delicious Winter Greens - What Works Best for You? Brassica plants are amazing to watch grow. I recently sowed two groups of them, half on Jan 11 and the other half on Jan 19. The 1/11 group is now 20 days old, while the 1/19 group is 12 days old. In just 8 more days they will