Growing Guide
 
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Cauliflower

Vegetable (Cool Season) - Cabbage Family

Brassica oleracea var. botrytis (Cauliflower)
Brassicaceae Family

The most finicky and difficult of the cole (cabbage family) crops to grow, cauliflower flourishes when temperatures are moderate. Purple (left), orange and yellow-green colored varieties make good addition to flower gardens.

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Site Characteristics
Sunlight:
  • full sun
Can tolerate light shade but will slow maturity. Light shade can be beneficial in warm weather.

Soil conditions:

  • requires well-drained soil
Prefers well-drained, fertile soil high in organic matter, pH 6.0 to 7.5. Can tolerate slightly alkaline soil. Needs plentiful, consistent moisture.
Plant Traits

Lifecycle: annual

Biennial grown as an annual.

Ease-of-care: difficult

In addition to tying heads to blanch white-headed varieties, cauliflower requires good soil, timely planting and protection from pests.

Height: 1 to 2 feet

Spread: 1.3 to 3 feet

Foliage color:

  • medium green
  • dark green

Some varieties have white stems and veins.

Foliage texture: medium

Shape: cushion, mound or clump

Special Considerations
Tolerates:
  • frost - Mature heads will not tolerate hard freezes.
Special characteristics:
  • not native to North America - Not known in the wild. Descended from wild Mediterranean kale.
Growing Information
How to plant:

Propagate by seed

Germination temperature: 45 F to 85 F - Will germinate at soil temperatures as low as 40 F.

Days to emergence: 4 to 7

Seed can be saved 5 years.

Maintenance and care:
Most finicky of the cole (cabbage family) crops. Heads will not develop properly in hot or dry weather, so timing is crucial. Will tolerate cold as well as other cole crops in spring, but mature heads are not resistant to hard freezes.

Sow seeds indoors 4 to 6 weeks before average last spring frost. Keep soil warm (about 75 F), until germination. Then keep plants around 60 F. Provide direct sun so plants don’t get leggy. When plants are 4 to 6 weeks old, transplant into garden 15 to 24 inches apart in rows 24 to 36 inches apart. Wait until soil temperature is 50 F or above and danger of frost is past before transplanting.

Larger, older transplants are more likely to bolt when exposed to cool temperatures in the garden. Transplant when plants have four or five true leaves.

Some cultivars will form small “button” heads when the weather turns warm following a 10-day stretch when high temperatures only reach the 40s F.

Direct seeding is more difficult than with other cole crops, especially in spring. For fall crops, plant seed in late-spring early summer to inch deep, about 3 inches apart. Thin to final spacings. Or start transplants in late May and transplant in late June or early July.

Plants have shallow root systems. Avoid even shallow cultivation. Mulch to protect roots, reduce weed competition and conserve moisture.

To preserve the white color of the curd, use string or rubber bands to secure outside leaves over the head when it is about 2 to 3 inches in diameter. From tying to harvest may take less than a week in summer or as long as a month in fall.

Too much sun, heat or nitrogen fertilizer can cause “ricey” heads where the curd separates into small, rice-like grains.

Pests:
Cabbageworms - Handpick and destroy. Row covers may be useful on small plantings to help protect plants from early damage. Put in place at planting and remove before temperatures get too hot in midsummer.

Flea beetles - Use row covers to help protect plants from early damage. Put in place at planting and remove before temperatures get too hot in midsummer. Control weeds.

Cabbage root maggot - White maggots (larvae) attack all plants of the cabbage family. Larvae tunnel in and feed on roots of plants. Damage causes wilting early on, death of plants a little later on.

Cabbage aphids - A hard stream of water can be used to remove aphids from plants. Wash off with water occasionally as needed early in the day. Check for evidence of natural enemies such as gray-brown or bloated parasitized aphids and the presence of alligator-like larvae of lady beetles and lacewings.

Other pests:

Slugs and snails
Cutworms

Diseases:
Clubroot - Locate new plants in a part of the garden different from previous year's location. If soil is infested, add lime to raise pH to 7.2

Purple blotch (Alternaria porri) - Avoid wetting foliage if possible. Water early in the day so aboveground plant parts dry as quickly as possible. Avoid crowding around plants; space apart to allow air circulation. Eliminate weeds around plants and garden area to improve circulation. Practive sanitation: when plants are not wet, carefully remove and destroy affected plant parts. In autumn, rake and dispose of all fallen or discarded leaves and fruit.

Other diseases:
Black rot
Black leg
Cabbage yellows

Varieties
Browse cauliflower varieties at our Vegetable Varieties for Gardeners website.

Chose several maturity dates for extended harvest.

Some varieties have leaves that cover the head, making it less critical to tie leaves around the head to blanch. Purple-, orange- and yellow-green-headed varieties don’t need tying.

Orange heads high in beta-carotene.

Look for varieties that are cold- and/or heat-tolerant. Heat-tolerant varieties are usually more easily damaged by frost when mature, so they are not good choices for fall crops. Those that are cold-tolerant usually don’t make good spring crops, because they are less likely to stand up to heat when they mature.

“Broccoflowers” are a broccoli/cauliflower cross.

Varieties recommended for New York include:

Alert
Amazing
Candid Charm
Cheddar
Early White
Self Blanche
Snow Crown
Violet Queen