of the same species.
harvest the central cluster before it blooms. to tell if the cluster is ready for harvest, rub your thumb over the closed buds on the broccoli head. as long as the buds feel tight, the cluster is still growing. as soon as the buds start to loosen and spread out, cut the cluster with stem attached, using a sharp knife. you should cut the head even if it is small once the buds start spreading as the head will not continue to grow larger once this process starts.
several days after the central cluster has been harvested, your plant will send out side shoots (smaller versions of the 