Farmerdill wrote: If the plants are vigourous they will head eventually, weather permitting. Some cultivars of cabbage and broccoli have a very long season ( 4 months or more) As daylenght decreases they slow down even more. I t pays to pay attention to cultivars, for most of us with hot summers, short season cultivars are best for both spring and fall planting. Tucson may have be warm enough for winter growing, in which case the long season cultivars will do ok harvested in December-January. This is a long season broccoli transplanted in late August (Barbados) and it it just beginning to show signs of heading.