Cauliflower Plant Guide: How to Grow Cauliflower From Seed to Harvest

To grow a cauliflower plant, start seed indoors about 7 to 9 weeks before your last spring frost, set the young plants out 1 to 2 weeks before that frost, and keep them growing without a pause until the head is cut. That is the latest of the three frost-based rules the guides give; the other two set plants out 3 to 4 weeks ahead, or no sooner than 2 to 3 weeks ahead. Every source read for this guide agrees on the hard part: cauliflower punishes stress. Cold snaps, heat, drought or a transplant that sat too long in its cell can all leave you with a big leafy plant and a head the size of a coin. Mid-Atlantic gardeners generally do better with a fall crop sown in July.

Cauliflower at a glance

Sun	Full sun, at least 6 hours a day, 8 to 10 preferred
Sowing depth	1/4 to 1/2 inch
Spacing	12 to 24 inches in the row, most often 18; rows 2 to 3 feet apart
Soil temperature	70 F or warmer until the seed comes up, then 60 F, in one guide; another uses no bottom heat
Growing temperature	An average of 60 to 65 F preferred; curds form at 50 to 70 F
Water	About 1 to 2 inches a week
Days to maturity	50 to 80 days from transplanting
Frost tolerance	Semi-hardy: light frosts, not heavy frosts or freezing

When to plant cauliflower

Two dates run the cauliflower calendar: your average last spring frost and your average first fall frost. The table below uses four airport weather stations and their 1991 to 2020 freeze normals (the date with a 50 percent chance of a 32 F night, in spring and in fall) and applies one guide's spring rule: sow transplants 6 to 7 weeks before you plan to set them out, and set them out 1 to 2 weeks ahead of the last frost. Added together, that puts indoor sowing 7 to 9 weeks before the last frost.

Spring cauliflower dates at four weather stations (1991 to 2020 normals)

Station	Last spring frost (50%)	Sow indoors	Set out transplants	First fall frost (50%)
Minneapolis-St. Paul, MN	Apr 23	Feb 19 to Mar 5	Apr 9 to Apr 16	Oct 18
Baltimore (BWI), MD	Apr 10	Feb 6 to Feb 20	Mar 27 to Apr 3	Oct 31
Raleigh-Durham, NC	Mar 31	Jan 27 to Feb 10	Mar 17 to Mar 24	Nov 4
Dallas-Fort Worth, TX	Mar 8	Jan 4 to Jan 18	Feb 22 to Mar 1	Nov 24

Frost dates: 1991 to 2020 station normals, the date with a 50 percent chance of 32 F. Sow indoors = 7 to 9 weeks before the last frost; set out = 1 to 2 weeks before it, the latest of the guides' three frost-based rules.

Find your nearest station, or look up the normals for your own town, and count back the same way. A zone number is not a frost date: two towns in the same zone can be weeks apart. The guides do not agree on how early the plants can go out: one allows 3 to 4 weeks ahead of the frost-free date, another sets 2 to 3 weeks ahead as the earliest, and a third gives 1 to 2 weeks. The table uses the latest of the three, which is the gentler choice for a crop that can button after a cold shock.

Spring vs fall cauliflower: heat, cold and buttoning

Cauliflower forms its curd in a narrow band of weather. Dense, flavorful curds grow between 50 F and 70 F, the plant prefers an average of 60 to 65 F, and growth suffers when it stays above 75 F. Hot weather sets a hard ceiling: days at 86 F with nights over 77 F can stop a crown from forming at all.

Spring is the tricky season. A plant set out early enough to finish before summer heat also risks a cold spell. Ten or more days in a row between 35 and 50 F, after a stretch of good growth, can push cole crops to bolt, and the bigger the plant, the more likely it is. In some years the compromise between too cold and too hot may be almost impossible.

That is why gardeners in the Mid-Atlantic generally do better with fall production. Fall cauliflower grows its leaves in summer warmth and makes its head as the weather cools, and colder fall weather helps the crop hold its quality in the garden longer.

Buttoning is the classic failure: a head that stops growing at about an inch across. It is usually due to stress, such as transplants that grew too big in their cells, and hot or cold spells while the head is forming. Buttoning often follows dry soil, low temperatures, low nitrogen or transplant shock, and larger, older transplants are more prone to it. The fix is in the timing and in never letting the plant stall.

Fall timing by region. In the Mid-Atlantic, fall seed is sown in early July and plants are set out from late July to early August. In Minnesota, fall seed starts in early to late July, indoors or straight in the garden. In the South Carolina Piedmont, fall transplanting runs from July 15 to August 31, and from August 15 to 30 on the coast. Another guide gives a count-back instead: plant 50 to 75 days before you want to harvest, and aim for the heads to mature about 1 to 2 weeks past your first fall frost. Where your state's calendar and the count-back differ, the regional calendar comes from growers in your climate, so lean on it.

Winter crops. Where winters are mild and temperatures rarely fall below 32 F, transplants can go out any time from September through February.

Starting cauliflower seeds indoors

Fill cells with a sterile, soilless mix and push each seed down one-fourth to one-half inch. Expect sprouts in about two weeks, and put bright grow lights over the seedlings as soon as they come up.

The guides split on heat. One says to hold the soil at 70 F or warmer until the seed germinates, if possible, and at 60 F after that, which a heat mat can do in late winter. Another says not to use bottom heat, because the seed sprouts readily in summer temperatures; that advice reads as written for a July sowing of the fall crop. For a February sowing in a cool room, the warmer start is the one to follow, and once the seedlings are up, cooler is better.

Feed lightly: a starter solution at half strength weekly from the first true leaf, and twice a week once two true leaves are showing. One guide starts hardening the plants off once they have four or five true leaves, roughly four weeks after sowing.

How long to keep them indoors varies by guide: about 4 to 8 weeks for a spring crop, and about 4 to 6 weeks for fall. What they all stress is that the plant must still be growing actively on the day it goes out.

Transplanting cauliflower without a check

Growers call a pause in growth a check, and cauliflower does not recover from one well. Use young, active transplants, and never buy stunted plants that were held too long in flats. The guides set the age limit in different places: one sets seedlings out by the time they are 4 to 5 weeks old, while another grows them 5 to 7 weeks before they go out. A third waits for a root system that fills the cell and 4 to 6 mature leaves.

1. Harden off over a week. Cut back water and put the plants outside in a sheltered spot with a couple of hours of sun, then give them more sun and wind day by day.
2. Space them. Set plants 18 inches apart for most beds; see the table below for the full range.
3. Plant at the same depth they sat in their cells, and water them in with a starter solution.
4. Cover the row. A row cover in the first weeks shelters the plants from wind and insects: a heavier cloth in spring for cold and a light one in summer so the plants do not overheat. Anchor the edges well: a loose cover flapping in the wind can do more harm than none. A floating row cover from planting day also keeps flea beetles and root maggots off young plants.
5. Feed and water steadily. Side-dress about 3 to 4 weeks after setting plants out, or once they reach about four inches tall; one guide waits until they are half grown. If a week passes with under an inch of rain, give the bed a thorough soaking.

Direct sowing works too, mostly for fall. Drop three or four seeds per spot, 12 to 18 inches apart and one-fourth to one-half inch down, then thin to one seedling per spot.

What to plant with cauliflower

It is well documented that arugula, mustard and some other spicier brassicas can work as flea beetle trap crops, and mixing 3 or more trap species works better than one. Nasturtium also acts as a trap crop for cauliflower and kale. One guide says broccoli interferes with cauliflower, but cites no study. More: what to plant with cauliflower.

Soil, spacing and water for cauliflower

Every source wants fertile, well-drained soil that still holds moisture. Soil pH targets run from 5.8 to 7.5 across the guides, and every range given includes 6.0 to 6.5, so a soil test before planting is worth the trouble. Cauliflower is a heavy feeder, and no cole crop reacts worse to poor conditions.

Cauliflower numbers: the range across the guides

What	Range in the guides	Detail
Seed depth	1/4 to 1/2 in	1/2 in when sown in place
Spacing in the row	12 to 24 in	18 in most often; one guide widens it for fall
Between rows	2 to 3 ft	24 to 36 in
Indoor growing time	About 4 to 8 weeks for spring	About 4 to 6 weeks for fall; one guide sets out no older than 4 to 5 weeks
Set out in spring	1 to 4 weeks before the last frost	Guides give 3 to 4 weeks, no sooner than 2 to 3, or 1 to 2; MN early to mid-April; SC Piedmont Mar 20 to Apr 30
Days to harvest	50 to 80 from transplanting	50 to 60 for spring varieties; tied heads 7 to 12 days after blanching starts

Each row spans every figure the guides give for it. Read in October 2026; see Sources we used.

Water deeply: about 1 to 2 inches of water a week, enough to reach at least 6 inches deep, early in the day so the foliage dries before dark. A three to four inch mulch of weed-free straw, or grass clippings free of herbicide, can help hold weeds back.

Blanching cauliflower: self-blanching vs tying leaves

Sun on a white head turns it yellow and can change the flavor. Blanching shades it. The method is the same everywhere; the guides differ a little on the moment to start:

• When: once the head is about silver-dollar size, about 2 inches across, or when the white curd is 2 to 3 inches across.
• How: draw three or four big outer leaves up over it and hold them with a rubber band, or snap them over the top and tuck them in on the far side. In warm weather, tie loosely so air can move.
• How long: blanching usually takes 4 to 8 days and may take longer in fall. One guide expects to cut about 7 to 12 days after blanching starts.

Self-blanching varieties grow inner leaves that curl over the head on their own. Under cool conditions they blanch well and need no tying, and many newer varieties work this way. One caution: a tied head may stay humid, which favors the leaf spot disease Alternaria, so blanch only when you need to. One guide skips it in the cool, short days of fall, while another blanches fall heads too and allows them longer.

Purple, orange, green and Romanesco cauliflower

Do not tie leaves over colored heads: orange, green, purple and Romanesco types need sun on the curd to develop their full color. Varieties come in white, orange, purple and green, plus Romanesco with its pointed spiral head. The pointed green Romanesco is a fall crop.

On purple heads the guides disagree about what the plant even is. One calls purple cauliflower a type of broccoli that looks like cauliflower, needs no blanching and turns green when cooked; two others simply list purple among the cauliflower colors. For the gardener, the care is the same either way: grow it like cauliflower and leave the head in the sun.

Harvesting and storing cauliflower

Cut the head while it is compact and firm, before the curds start to separate. A well-grown head reaches 6 to 12 inches across. Wait too long and the head turns coarse and grainy; once you can see individual florets, quality falls off fast. Harvest comes 50 to 80 days after transplanting, depending on the variety.

Cut the main stem and leave a ruff of green leaves around the head to keep it longer. A head keeps about one week in the refrigerator. In cold (32 F), moist storage the guides give 2 to 4 weeks, and one says no more than three. Cauliflower rarely sends up side shoots, so the plant can go on the compost pile once the head is cut.

When heads go wrong: leaves growing through the head can come from heat or water stress; a loose, open head usually matured in hot weather; brown curds can come from downy mildew in wet weather or from a lack of boron; and a hollow stem, which one guide calls the most common cauliflower problem, ties to low soil pH among other factors.

Cauliflower seeds and supplies

Choose seed by season. For spring, look for a fast, heat-tolerant white with a short 50 to 60 day cycle, such as Snow Crown at 50 days. For fall, the guides split: one picks early-maturing varieties, another midseason and storage types. For color, a purple type such as Sicilian Violet and a green Romanesco both skip the blanching step.

The gear is short: a cell tray with a clear dome and a heat mat for a late-winter start, a floating row cover or insect netting for the first weeks outdoors, and a sharp knife or snips for the harvest cut.

What you'll need for cauliflower

As an Amazon Associate we earn from qualifying purchases.

• 

  Sow Right Seeds Di Sicilia Violetto Cauliflower Seed

  A purple head that needs no blanching.

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• 

  Mountain Valley Seed Co Self Blanche Cauliflower Seeds

  A short-season white for the spring window.

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• 

  Burpee 72 Cell Greenhouse Kit

  Cells for a late-winter indoor start.

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• 

  Agribon AG-19 Floating Row Cover, 10 x 50 ft

  Row cover from planting day keeps flea beetles and root maggots off young plants; a light cloth keeps them from overheating in summer.

  Check price on Amazon
• 

  Corona FS 3214D ComfortGEL Micro Snips

  A clean cut through the main stem.

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Sources we used

Five land-grant university extension services and one seed company supplied the growing advice here, read in October 2026. When their figures differ, each section gives the full spread or describes the split.

• "University of Maryland Extension: Growing Cauliflower in a Home Garden"
• "University of Illinois Extension: Cauliflower"
• "Clemson Cooperative Extension, HGIC 1326: Cauliflower"
• "University of Minnesota Extension: Growing cauliflower in home gardens"
• "Utah State University Extension: How to Grow Cauliflower in Your Garden"
• "Johnny's Selected Seeds: Cauliflower Key Growing Information"
• "University of Minnesota Extension: Companion planting in home gardens"
• "Utah State University Extension: Creating Sustainable School and Home Gardens, Companion Planting"
• "Illinois Extension: Plants that inhibit other plants"
• "NOAA NCEI: U.S. Climate Normals, 1991-2020": frost dates at the four cauliflower stations

Related guides

• Growing rosemary, one of the herbs that can draw parasitic wasps onto diamondback moth caterpillars, which feed on cauliflower leaves
• Getting rid of fungus gnats, the flies a damp tray of indoor starts can draw
• How to grow kale, the hardier cousin for the same fall beds
• How to grow turnips and rutabagas, timed by the same fall count-back
• How to grow radishes, quick to fill the rows between slow cauliflower
• How to grow asparagus, also sown indoors while it is still winter
• How to grow brassicas, for rotation years and clubroot
• How to grow arugula, a fast green that can double as a flea beetle trap crop
• How to grow carrots, a cool-season root crop for spring and fall beds

Frequently asked questions

When should I plant cauliflower?

Plant cauliflower in spring or in July for fall. For spring, set transplants out 1 to 2 weeks before the last frost, which means sowing indoors 7 to 9 weeks before it; some guides allow 2 to 4 weeks ahead. In the Mid-Atlantic, fall seed is sown in early July and plants are set out from late July to early August, and gardeners there generally do better in fall.

How do you care for cauliflower plants?

Keep cauliflower growing without a pause, with steady water and fertile soil. It needs about 1 to 2 inches of water every week, and a mulch helps hold soil moisture. Side-dress about 3 to 4 weeks after transplanting. Cauliflower is a heavy feeder, and soil pH targets run from 5.8 to 7.5, with every range including 6.0 to 6.5.

How far apart should cauliflower plants be?

In the row, space cauliflower 12 to 24 inches apart, most often 18 inches, with 2 to 3 feet between rows. One guide keeps the wider spacing for fall plantings.

How long does cauliflower take to grow?

Cauliflower takes about 50 to 80 days from transplanting, after about 4 to 8 weeks of indoor growth. For spring planting, pick a variety with a short 50 to 60 day cycle.

When do you harvest cauliflower?

Harvest cauliflower while the head is compact and firm, before the curds begin to separate. A well-grown head reaches 6 to 12 inches across. Leave a ruff of leaves around the head. The plant does not ordinarily make side shoots.

Why is my cauliflower not forming a head?

Stress is the usual cause. Buttoning, a head that stalls at about an inch across, often follows dry soil, low temperatures, low nitrogen and shock at planting, and larger, older transplants button more often. Heat counts too: days at 86 F with nights over 77 F can stop a crown forming.

Do I have to tie cauliflower leaves?

Only on white varieties that do not blanch themselves. Draw three or four outer leaves over the head when it is the size of a silver dollar to about 2 or 3 inches across; blanching usually takes 4 to 12 days and may take longer in fall. Leave purple, orange, green and Romanesco heads uncovered, because their full color needs sun.

Can you plant broccoli and cauliflower together?

One extension post says that "broccoli interferes with related crops such as cabbage or cauliflower," but it gives no spacing or planting advice and, in our reading, cites no study. Some spicier brassicas, arugula and mustard among them, can act as flea beetle trap crops for the cabbage family; that much is well documented.