If the stem gets too large and skin is tough just peel the skin off. The stem flesh is still very crisp and juicy. Prepare fertile, well-drained soil. Sow seeds in spring after last frost to early summer or late summer to early fall. Sow seeds in late spring to fall (cool areas), and can be planted year round in subtropical areas. Keep soil moist. Harvest main stalk when about 8-10" tall and when 2-3 flowers are about to open. After this cut, the plant branches freely for an extended harvest but stems and leaves will be smaller. Blanche then stir-fry stalks, leaves and buds with garlic, a little sugar and some rice wine or boil and dress with oyster sauce. Use in soups, sukiyaki, and tempura. Can be cooked like choy sum. Blanching before cooking helps tenderize stems and leaves.