蜜桃恋人

How to Grow Cauliflower: The Complete Guide

Photo Credit
Pixabay
Botanical Name
Brassica oleracea
Plant Type
Vegetable
Sun Exposure
Full Sun
Soil pH
Slightly Acidic to Neutral
Bloom Time
Spring
Flower Color
White
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Planting, Growing, and Harvesting Cauliflower

Catherine Boeckmann

Cauliflower is a sun-loving, cool-season crop to grow in spring and fall. An annual plant in the cabbage family, cauliflower has edible white flesh that is extremely healthy and considered a 鈥渟uperfood.鈥

About Cauliflower

This vegetable’s name comes from the Latin words caulis, for cabbage, and floris, for flower. It’s a descendant of wild cabbage! Like its cousin broccoli, the tightly bunched florets of cauliflower are connected by a thick core, often with a few light leaves surrounding it.

Though usually white, cauliflower does come in other colors, including purple, yellow, and orange. No matter the color, the taste is the same: mild, slightly sweet, and a little nutty.

Cauliflower can be a challenge for beginner gardeners because it requires consistently cool temperatures in the 60掳Fs. Otherwise, it may prematurely 鈥渂utton鈥濃攆orm small, button-size heads鈥攔ather than forming a single, large head.

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Planting

Cauliflower should be grown in a spot that gets full sun (6 to 8 hours of sunlight per day). Lack of sunlight may produce thin, leggy plants and subpar heads. In summer, shade plants from the hot sun, if necessary.

Soil needs to be very rich in organic matter; mix aged manure and/or compost into the bed before planting. As an alternative, apply 5-10-10 fertilizer to the planting site. Fertile soil helps to prevent heads from buttoning.

When to Plant Cauliflower

  • Cauliflower grows best as a fall crop (cool weather is best for head formation), but can be grown in spring, too.
  • We suggest buying cauliflower seedlings (aka 鈥渢ransplants鈥) versus starting them from seed, as cauliflower can be finicky.
  • Spring Planting:
    • If you start from seed, sow seeds indoors 4 to 5 weeks before the last spring frost date.
    • Plant seedlings outdoors 2 to 4 weeks before the last spring frost date.
  • Fall Planting:
    • Plant a fall crop 6 to 8 weeks before the first fall frost date, but after daytime temperatures are regularly below 75掳F.

How to Plant Cauliflower

  • Sow seeds in rows 3 to 6 inches apart and up to 陆 inch deep.
  • Set plants 18 to 24 inches apart with 30 inches between rows.
  • In early spring, be ready to protect plants from frost by covering them with old milk jugs, if necessary. Extreme cold can halt growth and/or form buttons.
  • Water consistently during germination and growth. Add mulch to conserve moisture.

Growing

  • Cauliflower dislikes any interruption to its growth. Change, in the form of temperature, moisture, soil nutrition, or insects, can cause the plants to develop a head prematurely or ruin an existing one.
  • Water regularly with 2 inches of water per square foot each week; even with normal rainfall, this usually requires supplemental watering.
  • For best growth, side-dress the plants with a high-nitrogen fertilizer 3 to 4 weeks after transplanting.
  • Note that the cauliflower will start out as a loose head and that it takes time for the head to fully form. Many varieties take at least 75 to 85 days from transplant. Be patient!
  • Brown heads indicate a boron deficiency in the soil. Drench with 1 tablespoon of borax in 1 gallon of water. (Avoid getting boron on other plants.) Or, provide liquid seaweed extract immediately; repeat every 2 weeks until symptoms disappear. In the future, add more compost to the soil.
  • For white varieties, pink heads can indicate too much sun exposure or temperature fluctuations. Purple hues can be due to stress or low soil fertility.

Blanching Cauliflower Heads

When the curd (the white head) is 2 to 3 inches in diameter, blanch it: Tie the outer leaves together over the head and secure with a rubber band, tape, or twine to keep light out. (This is not necessary for self-blanching or colored varieties). The plants are usually ready for harvest 7 to 12 days after blanching.

Types

  • 鈥楪谤补蹿蹿颈迟颈鈥: purple; tends to be milder and sweeter than the white varieties.
  • 鈥楽苍辞飞产补濒濒鈥: smooth, white, medium 6-inch heads; a good yield throughout the growing season.
  • Orange varieties, such as 鈥楥丑别诲诲补谤鈥 and 鈥楩lame Star鈥, are creamier and sweeter than white varieties with more vitamin A.

cauliflower_full_width.jpgCauliflower at a farm stand in Washington, D.C., 2019. Credit: Wendy Hagen.

Harvesting

  • Plants are usually ready to harvest in about 50 to 100 days, depending on variety, or 7 to 12 days after blanching.
  • When the heads are compact, white, and firm, then it is time to harvest them. Ideally, the heads will grow to 6 to 8 inches in diameter.
  • Cut the heads off the plant with a large knife. Be sure to leave some of the leaves around the head to keep it protected.
  • If the heads are too small, but have already started to open up, they will not improve and should be harvested immediately.
  • If the cauliflower has a coarse appearance, it is past maturity and should be tossed.

How to Store Cauliflower

  • Store heads in a plastic bag in the refrigerator. They should last for about a week.
  • For long-term storage, you can also freeze or pickle the heads. To freeze, cut into 1-inch-bite pieces. Blanch for 3 minutes in lightly salted water. Cool in an ice bath for 3 minutes, drain, and package. Seal and freeze.
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Wit and Wisdom

Cauliflower is nothing but cabbage with a college education.
-Mark Twain (1835-1910)

Pests/Diseases

Cauliflower Pests and Diseases

Pest/DiseaseTypeSymptomsControl/Prevention
AphidsInsectCurled, misshapen/yellow leaves; distorted flowers/fruit; sticky 鈥渉oneydew鈥 (excrement); sooty, black moldGrow companion plants; knock off with water spray; apply insecticidal soap; put banana or orange peels around plants; wipe leaves with a 1 to 2 percent solution of water and dish soap (no additives) every 2 to 3 days for 2 weeks; add native plants to invite beneficial insects (such as ladybugs)
Black rotFungusYellow, V-shape areas on leaf edges that brown and progress toward leaf center; leaves eventually collapse; stem cross sections reveal blackened veinsDestroy infected plants; choose resistant varieties; provide good drainage; remove plant debris; rotate crops
Cabbage loopersInsectLarge, ragged holes in leaves from larval feeding; defoliation; stunted or bored heads; excrementHandpick off plants; add native plants to invite beneficial insects; spray larvae with insecticidal soap or Bacillus thuringiensis (Bt)鈥攁 natural, bacterial pesticide; use row covers; remove plant debris at end of season
Cabbage root maggotsInsectWhite maggots become gray flies that resemble small houseflies. Wilted/stunted plants; off-color leaves; larvae feeding on rootsUse collars made of plastic or tin foil around seedling stems; monitor adults with yellow sticky traps; use row covers; destroy crop residue; till soil in fall; rotate crops
CabbagewormsInsectLeaves have large, ragged holes or are skeletonized; heads bored; dark green excrement; yellowish eggs laid singly on leaf undersidesHandpick; use row covers; add native plants to invite beneficial insects; grow companion plants (especially thyme); spray Bt (Bacillus thuringiensis)
ClubrootFungusWilted/stunted plants; yellow leaves; roots appear swollen/distortedDestroy infected plants; solarize soil; maintain soil pH of around 7.2; disinfect tools; rotate crops
Downy mildewFungusYellow, angular spots on upper leaf surfaces that turn brown; white/purple/gray cottony growth on leaf undersides only; distorted leaves; defoliationRemove plant debris; choose resistant varieties; ensure good air circulation; avoid overhead watering
Nitrogen deficiencyDeficiencyBottom leaves turn yellow and the problem continues toward the top of the plantSupplement with a high nitrogen (but low phosphorus) fertilizer or blood meal. Blood meal is a quick nitrogen fix for yellowing leaves
Stink bugsInsectYellow/white blotches on leaves; shriveled seeds; eggs, often keg-shape, in clusters on leaf undersidesDestroy crop residue; handpick (bugs emit odor, wear gloves); destroy eggs; spray nymphs with insecticidal soap; use row covers; weed; till soil in fall
ThripsInsectLeaves, especially in folds near base, have white patches or silver streaks; brown leaf tips; blistering/bronzing on leaves; brown streaks on cauliflower curds; heads distorted or stunted; curling or scarringRemove plant debris; choose resistant varieties; add native plants to invite beneficial insects; use row covers; use straw mulch; monitor adults with yellow or white sticky traps; use sprinklers or other overhead watering
White rustFungusChalk-white blisters mainly on leaf undersides; small, yellow-green spots or blisters, sometimes in circular arrangement, on upper leaf surfaces; possible distortion or galls; stems may also be infected. More common with warm days and cool/moist nightsDestroy infected plants; choose resistant varieties; weed; destroy crop residue; rotate crops

Recipes

Cauliflower and Brie Soup
Sweet 鈥檔鈥 Sunny Cauliflower Salad
Vegetables
 

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Comments

Claire (not verified)

9 years 6 months ago

Hi I am a novice allotmentier and am having trouble with my caulis. I have planted the seedlings out as suggested with the correct amount of space inbetween, but some of them seem to be dying already, the leaves have changed colour a bit and have gone floppy - not looking too promising. I don't know if I have over or underwatered. I have no made a bit of protection from wind incase that is the problem. Advise appreciated as at this rate I don't think I will get to the 'button stage' at all! Thank you

It is impossible to know exactly what might be causing your caulis to collapse, Claire. Here are a few thoughts:
鈥 is the soil good composted matter?
鈥 what is the soil pH? it should be 5.5 to 7.5 (see here: http://www.almanac.com/content/ph-preferences)
鈥 assuming all conditions are favorable, sometimes plants need a little time to get used to the transplant and set roots
鈥 are you watering often enough?
鈥 did you give them a little help when planted, for example a spoonful of fertilzer: chicken poop pellets (not raw poop) or liquid seaweed diluted in water or a a fistful of nice compost?
鈥 have you "collared" the plants to deter hungry pests from crawling up the stem and eating leaves, ultimately weakening the plants? A strip of aluminum foil works well, lightly wrapped around the stem (don't choke the plant)
We hope this helps.
 
 
 

Sahil Thakur (not verified)

9 years 6 months ago

Sir/Mam what happened if there is excess of rainfall on crop ?
Will planting of crop during rainy season will be beneficial or it may create loss?

NewGardner (not verified)

9 years 7 months ago

After reading the different questions and post I have concerns on growing cauliflower in a greenhouse. I have a fan that blows the hot air out, however it can get up to 90 degrees in the heat of the day. Should I transplant these to the out door garden? The temperatures here in Northern NV can reach 90or higher in the Summer so not sure which location would be best. Right now they are growing like crazy but I am getting a few yellow leaves at the bottom.

Cauliflower is a cool-weather crop that requires cool even temperatures to mature. Transplant your seedling outdoors in a spot that will be shaded from the hot afternoon sun.

donwilliams (not verified)

9 years 8 months ago

My cauliflower is turning pink is that a problem?

Cauliflower can turn pink for a few reasons.
 
1) Some varieties naturally turn pink. 'Snow Crown' may turn pinkish in the heat of summer.
 
2) White forms, even if self-blanching, will sometimes have a pinkish tinge if exposed to too much sunlight. To keep the head white, cover the developing head by lifting the leaves loosely over it to protect it from the sun; secure the leaves with a clothespin or string.
 
3) 蜜桃恋人 fluctuations can also cause pink or purple tinges. Hot weather followed by cool can trigger it. Very cool temperatures at harvest time can also cause pinking in the interior branches.
 
4) Age can cause purpling of the curds.

Alison Bray (not verified)

9 years 11 months ago

Can you eat a cauli that has turned brown?

Hi Alison,
Brown cauliflower is not good to eat. Sometimes you can cut off the brown parts and use the inside parts that are white.

Dr. Mohammad M鈥 (not verified)

10 years ago

Dear All,
Could you please let me know the reason why small curd develops in the stem of cauliflower plant. One curd is obvious in one cauliflower plant, but we found some plant bear small curds below the main curd. We will be grateful if someone give us the reason why it is happening. For your better knowledge, we are cultivating cauliflower in Bangladesh and it is a subtropical country and the temperature is 30 - 20 degree C respectively at day and night. Thanks