VeggieHarvest

Cauliflower is an annual cool-season crop, half-hardy to frost and light freezes. To prevent spreading clubroot and other soil-borne diseases, don't compost any brassica roots. Pull and destroy all infected plants. Also rotate brassica plants on at least a 3 year basis, preferably on a 7 year basis.

Where to Grow Cauliflower

Wherever there are steady, cool growing seasons, frost free.  It is a little more particluar than other brassicias and around 60 degrees is the preferred temperature.

Reccomended Varieties of Cauliflower

Early Snowball; Snowball Imperial; Self-Blanch (fall); and Early Purple-Head (fall, not blanched).

Soil for Cauliflower

Fertile, enriched loam is ideal with pH from 6 to 7. Cauliflower is sensitive to boron deficiency in the soil.

Planting Cauliflower

Germination 3-10 days.

When - Cauliflower can be difficult to grow as a spring crop because it tends to bolt in the heat, it is generally easier to grow as a fall crop. It is the most sensitive of the brassicas to frost. Cauliflower should not be transplanted outdoors until all danger of frost is past, unless covered. It also needs to mature before hot summer weather arrives. A compromise might be to choose an intermediate starting date and cover the plants when set out to protect them from the cold. For fall crop, start seed in mid-June to set out transplants in late July. Allow 2 to 3 months growing time before first frost.

How - In rows 2 1/2 to 3 feet apart, with 2 feet between plants. Plant transplants 1" deeper than they were grown in starting pots, and cover with netting to protect from pests.

How Cauliflower grows

The plant has broad green-blue foliage that develops a central flower head. This increases in size to a large, cabbage-sized head of condensed flowers. By tradition the head is blanched (covered from the sun) to bleach it white. Spacing between plants determines head size: the closer together, the smaller the head. When heads start forming, prevent yellowing by tying several upright leaves loosely together with string, covering the rest of the head from direct exposure to sunlight.

Cultivating Cauliflower

The trick to cauliflower is to keep it growing steadily once the seedlings are planted outdoors. So much, however, depends on proper growing weather - ideally, a cool, long, sunny season with ample moisture or irrigation. When the center begins to develop a tight flower head about the size of a McIntosh apple, loosely tie the outer leaves with twine. Do not tie too tightly, as there must be some air circulation. This will cause the flower head to bleach white in about 1 to 2 weeks.

Harvesting Cauliflower

60-80 Days, from plants. As soon as the compact head is formed and blanched, it should be cut off with a sharp knife, along with several of the leaves for protection. The head should look full, and will likely be slightly smaller than supermarket varieties.  Harvest when the curds of the head are still smooth.  If too many heads ripen at once, cut them anyway and store in a cool, dark place for several weeks. Ripened heads left on the plant will rot and deteriorate rapidly.

Cauliflower Pests

Same for cabbage

- Root Maggot - Use a ground spray or granules of diazinon at planting time; or place 3 inch tar paper squares around each seedling when transplanting to cover the soil areas; or keep the ground dusted with wood ash.
- Cabbage butterflies/worms - controlling cabbage worms is suprisingly easy.  Cover susceptible crops with a floating row cover when planting and leave it in place until harvest.
- Aphids - spray with rotenone or pyrethrum
- Cutworms - Use stiff paper collars around transplants to extend at least 1 inch below the soil line.
- Flea beetles - Dust with wood ash or flour dust; spray with rotenone.

Diseases for Cauliflower

Same for cabbage

Soil fungicides are somewhat e effective on cabbage diseases, but they are expensive, sold in large quantity, and not practical for small home garden use, unless a great deal of cabbage is grown.

- Club root fungus - Most frequent in soggy or acid soil. Grow only in well-drained soil; follow crop rotation practices; lime to keep soil pH at a neutral 7.
- Yellows - A soil-borne diseases; choose resistant varieties.
- Black rot - Bacteria born on seed; buy only from reputable seed dealers or bedding plant growers; rotate crops.
- Blackleg - Bacteria spreads from infected plants, garden tools, and leftover debris. Follow crop rotation.