Imperial Broccoli (F1 Hybrid 70 Days)
A variety for mid to late summer harvest, performing best with a long day length that is accompanied with moderate heat. Imperial Broccoli is a dependable choice for growing in the northeastern summers. Domed heads are dark green with small beads and have an excellent post-harvest shelf life. Imperial Broccoli handles heat stress well.
Germination: 3-10 days
Germination Temperature: Optimum soil temperatures 65-85ºF.
Seed Sowing Depth: 1/4” deep
Starting Indoors: 4-6 weeks before the last frost. Sow 2-3 seeds per cell/pot. Thin to the strongest seedling. Fertilize the seedlings every 7-10 days with a liquid or water-soluble fertilizer, diluted to ¼ of the suggested measurement. Transplant a week or two before the last frost. Space 12-18" apart. Sow in early to midsummer for fall crops.
Sowing Outdoors: Spring when the soil temperature reaches at least 55ºF. Sow 2-3 seeds every 12-18” apart. Thin to the strongest seedling per space. Sow in midsummer for fall crops. Germination is slower at lower soil temperatures.
Harvest: Pick when heads are tight before flower buds start to open. For varieties that produce side shoots keep picked for a longer production
Tips: Provide Imperial Broccoli with fertile soil, rich in organic matter from the very beginning of its growth in the garden. Give adequate, even moisture for the best growth. Mulching helps retain moisture.