why don't my cabbage and cauliflower plants have heads? I just have lots of...
Cabbages may not produce heads if planted too close together. See our profile on cabbage for planting and growing information http://extension.umd.edu/learn/vegetable-profiles-cabbage
Cauliflower may not develop usable heads when plants are exposed to stressful conditions. Stressful conditions include exposure to prolonged periods (four or more days) of temperatures below 50 degrees Fahrenheit, dry conditions during the growing season, and infertile soils. See link from Cornell http://www.gardening.cornell.edu/homegardening/scene595b.html