Mei Qing Choi
Plant seeds ¼-½" deep. Transplant or thin small plants to 15-18" apart in rows 32-36" apart. Transplants can be started in April for May planting. Transplant after 4-6 weeks. Use a starter fertilizer, soaking the root ball thoroughly prior to transplanting. Direct seed in late spring, as seedlings can tolerate a light frost. Broccoli can be direct seeded up until mid-late June for a continuous harvest. Soil temperature should be 21-26°C (70-80°F) for optimal germination in 4-7 days.
Broccoli prefers full sun, but will tolerate part shade. Prepare a rich, loose soil that holds moisture well and has a pH level of 6.0-6.5. Broccoli is a heavy feeder and will also benefit from applications of calcium and magnesium, particularly during the early stages of growth.
Harvest when the buds of the head are firm and tight, cutting 5 to 10" down on the stalk. This will promote the growth of side shoots which will provide an abundance of smaller heads over a long period.
Pests & Diseases:
Cabbage worms and loopers (white and yellow butterflies) can be controlled using BTK, Rotenone or Pyrethrum. Use row covers to block out all insects including root maggots, aphids and Diamondback moths. Maintaining a soil pH of 6.8 and higher will discourage club root. Fungal and bacteria diseases such as head rot and downy mildew can be prevented by allowing good air circulation and avoiding a mid August maturity when the air humidity is higher. Strong healthy plants growing in an organically rich soil will be better able to fight disease.