First, so sorry it took so long for me to answer this. Your question has just been found. Now the sad news. Your broccoli has "bolted" or gone to see due to warm weather. Broccoli forms heads only in cool weather. In warm climates you must plant broccoli early in the spring before it becomes warm. Gardening is an adventure and keeps us learning so don't give up and try again earlier next year. Keep growing, Marianne Binetti