Garden-fresh cauliflower is a delicious treat. Cauliflower produces only one head per season (and no side shoots) and it takes up just as much space as broccoli, so plant more seeds than you would broccoli for the same yield.
Cauliflower is also a bit fussy about growing conditions. It wants nearly neutral soil pH (6.5-7.2) and needs a consistent and plentiful supply of moisture. If the soil gets too dry or the weather gets too hot, the plant may not produce a usable head. And unlike most vegetables in the cabbage family, it is somewhat sensitive to cold. Though the seedlings will tolerate a light frost, they should not be planted outdoors until daytime temperatures consistently stay over 50 degrees F.
Start cauliflower from seed indoors 5 or 6 weeks before the last frost. Seedlings tend to suffer from transplant shock if they get too big, so if you buy plants from a greenhouse, choose smaller, not bigger plants. If seedlings get root bound in their containers they will rarely produce anything more than a hard and inedible little knob instead of a big, snowy white head. Slip the plant out of the pot and take look at the roots; reject any that are root bound. Cauliflower are heavy feeders, so at planting time you should mix in compost and an organic all-purpose fertilizer. It's a good idea to side dress the plant with a little more fertilizer half way through the summer, or water in some diluted fish emulsion or seaweed fertilizer.
Pest issues are the same as those of broccoli: cut worms, flea beetles and cabbage worms. Covering plants with garden fabric (row cover) will help them get through the early part of the growing season when pests usually cause the most problems. Some gardeners blanch their cauliflower to keep the heads as white as possible. To do so, you need to tie a few leaves over the developing head when it gets to be about 2 to 3 inches across. Don't wait too long to harvest your head of cauliflower. Once the flower starts to separate, it will soon lose flavor and texture.
-Most of the general information provided is from the Vegetable Encyclopedia at www.gardeners.com, with additional facts provided by your friends at Seattle Seed Company.-