18 to 36 inches tall Click to see full answer. Similarly, you may ask, how much broccoli do you get from one plant?In general, broccoli plants can be harvested two or three times or for a period of up to three months. The plant first produces a large center head. This head should be cut at a slight angle with 5 to 6 inches of stalk. Once cut, the plant will produce smaller side heads for several weeks.Subsequently, question is, how does a broccoli plant grow? Broccoli requires full sun and moist, fertile soil that’s slightly acidic. Before you plant, in early spring, work in 2 to 4 inches of rich compost or a thin layer of manure before planting. (Learn more about soil amendments and preparing soil for planting.) Subsequently, one may also ask, is Broccoli hard to grow? Broccoli Planting Tips Seeds: Unless you start seeds indoors over the winter, it may be difficult to grow a spring broccoli crop from seed, because the weather will warm too quickly. Plant broccoli seeds about ¼ to ½ inch deep, and transplant to the garden in about 5 weeks.Does broccoli come back every year?Supposedly broccoli is an annual plant grown, harvested, then kaput at the end of the season. BUT some gardeners have been able to have perennial broccoli that produces year after year. The secret is to plant sprouting varieties, and you may have to experiment with the different types.