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Plant care

Cauliflower (cauli) care

Brassica oleracea var. botrytis

Also called cauli, broccoflower (chartreuse type).

RHS H5USDA Grown as an annual in zones 3-10Mildly toxic to petsIndoor 40-60 cm tall and wide

Watering rhythm

Direct sun (at least 4-6 hours)

Weekly deep watering

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Light

Direct sun (at least 4-6 hours)

Soil

Rich firm loam

Humidity

40-70% (outdoor)

Temp

15-21°C

Pet safety

Mildly toxic to pets

Mature size

40-60 cm tall and wide

Care at a glance

Light

Most houseplants will scorch where cauliflower thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. 6 hours of direct sun. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

For cauliflower in the ground or in a bed, aim for weekly deep watering. Soak the root zone rather than misting the foliage; deep, less-frequent watering trains roots downward and produces a more drought-resilient plant by mid-season. Inconsistent watering causes buttoning (premature small heads).

Soil and pot

Cauliflower grows best in rich firm loam. Compost-rich; pH 6.5-7.0. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Cauliflower sits happiest at around 40-70% (outdoor) humidity and 15-21°C (60-70°F). Outdoor humidity rarely matters. If you keep the room above 15 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed cauliflower sparingly. Balanced feed at planting; nitrogen side-dress mid-growth. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on cauliflower in the Growli community. Where a problem matches one of our diagnostic guides, click through for the full step-by-step recovery plan written for cauliflower specifically.

  • No head forms (buttoning) — Stress from cold, drought, or under-feeding when young.
  • Discoloured curds — Shade with the outer leaves — tie loosely over the head.
  • Cabbage caterpillars — Net plants or hand-pick eggs.
  • Clubroot — Rotate brassicas every 4 years.
  • Bolting in heat — Plant for spring or autumn harvest.

Companion plants

Cauliflower pairs well with Onion, Beet, Dill, and Thyme. These are species with similar light and water needs, so you can grow them in the same bed or container without conflict.

Propagation

Start seed indoors 4-6 weeks before transplant. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Cauliflower is mildly toxic to pets. Brassica oleracea isothiocyanates can cause GI upset and gas in cats and dogs in quantity. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Cauliflower care — frequently asked questions

What is the common name for Brassica oleracea var. botrytis?

Brassica oleracea var. botrytis is most commonly called Cauliflower, but it is also known as cauli, broccoflower (chartreuse type). The names refer to the same species, so care instructions for Cauliflower apply identically to anything sold as cauli.

How much light does cauliflower need?

Cauliflower grows best in direct sun (at least 4-6 hours). 6 hours of direct sun.

How often should I water cauliflower?

Water cauliflower weekly deep watering. Inconsistent watering causes buttoning (premature small heads). The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is cauliflower toxic to cats and dogs?

Cauliflower is mildly toxic to pets. Brassica oleracea isothiocyanates can cause GI upset and gas in cats and dogs in quantity.

What USDA hardiness zone does cauliflower grow in?

Cauliflower is rated for USDA zone Grown as an annual in zones 3-10 and RHS hardiness H5. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Cauliflower deep-dive guides

Every aspect of cauliflower care, each with its own calibrated guide:

Related guides

Cauliflower is also commonly called cauli or broccoflower (chartreuse type).