Cabbage care

Light

Cabbage is a sun-lover and needs the brightest spot in the home to thrive. 6+ hours of direct sun. Indoors that almost always means a south or west-facing windowsill in the northern hemisphere. Plants moved abruptly from low light to direct sun will scorch — acclimate them over 7-10 days by giving a little more sun each day.

Watering

Outdoor cabbage crops want 2-3 cm per week. The single best habit is a finger-test before watering — push a finger 3-4 cm into the soil. If it comes back damp, wait a day. If it comes back dust-dry, water deeply at the base of the plant. Consistent moisture prevents head-splitting and bitter leaves.

Soil and pot

Cabbage grows best in rich, well-drained loam. Compost-rich; pH 6.5-7.5. Lime acidic soils to deter clubroot. 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

Cabbage sits happiest at around 40-70% (outdoor) humidity and 7-24°C (45-75°F). Outdoor humidity rarely matters. If you keep the room above 7 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 cabbage sparingly. A balanced feed at planting; nitrogen side-dressing once heads start forming. 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 cabbage in the Growli community. Each is annotated with the most common cause so you know where to start.

• Cabbage white caterpillars — Cover with mesh from late spring.
• Cabbage root fly — White maggots in the roots; use brassica collars at planting.
• Splitting heads — Heavy rain after a dry spell; harvest as soon as the head feels firm.
• Loose heads — Insufficient water or over-rich soil.
• Clubroot — Acidic wet soil; lime and rotate.

Companion plants

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

Propagation

Sow seed in modules; transplant out at 4-6 weeks. Set deep with the lowest leaves at soil level. 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

Cabbage is mildly toxic to pets. ASPCA lists Brassica species as toxic to cats, dogs, and horses in quantity due to isothiocyanates. Small culinary amounts are tolerated; large raw amounts cause GI upset. 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.

Cabbage deep-dive guides

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

• Cabbage watering schedule
• Cabbage light requirements
• Best soil mix for cabbage
• Cabbage fertilizing guide
• When to repot cabbage
• How to propagate cabbage
• Cabbage growth rate & size
• Cabbage cold hardiness
• Cabbage temperature & humidity
• Is cabbage toxic to cats & dogs?

Related guides

Cabbage is also known as summer cabbage, autumn cabbage, and savoy cabbage.

• Tomato care — light, water and common problems
• Pepper care — light, water and common problems
• Cucumber care — light, water and common problems
• All 200 plant care guides in the Growli library