Brussels sprouts are so rewarding (and often challenging) to grow in short seasons. At Fruition Seeds, here in Zone 5, brussels sprouts require a full season to grow. Sown in early April (soil blocks are our favorite) and transplanted out in early May. If you haven’t already, download Fruition’s 40-page ebook on starting seeds to set you up for success! Be sure to feed your organic brussels sprouts with nutrient-dense compost as well as fish emulsion for an abundant harvest after about four weeks of consistent frost in fall, when flavor and tenderness are in their prime.