Kohlrabi 'Winner' (Winner kohlrabi) care

Light

Aim for at least 4-6 hours of direct sun on the leaves. Full sun, 6+ hours daily for fast, even bulb development. Tolerates a little shade in summer heat, which can also help delay bolting. If your only bright window faces south, that's perfect for kohlrabi 'winner' — same window any aroid would fry on.

Watering

Crops like kohlrabi 'winner' reward consistent watering — when top 2-3 cm of soil dries, about every 3-5 days; target roughly 2.5 cm of water weekly. The mistake is the daily light sprinkle: it never reaches the deeper roots. A long soak twice a week beats a five-minute splash every day. Keep moisture steady throughout bulb swell. Drought stress followed by rain causes splitting and a hot, fibrous texture; mulch to even out the supply.

Soil and pot

Kohlrabi 'Winner' grows best in rich, moisture-retentive, well-drained loam, ph 6.0-7.5. Prefers firm soil amended with compost. Maintain near-neutral pH to suppress clubroot and ensure good nutrient uptake. 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

Kohlrabi 'Winner' sits happiest at around 40-70% humidity and 7-24°C (45-75°F). Field vegetable unaffected by ambient humidity; root-zone moisture governs quality. Space for airflow to limit fungal leaf diseases. 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 kohlrabi 'winner' sparingly. Feed as a heavy feeder: rich base dressing of compost or balanced fertiliser, then one nitrogen side-dress about 3-4 weeks after planting to push leafy growth that fuels the bulb. 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 kohlrabi 'winner' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Woody or hot-flavoured flesh — From over-mature bulbs or moisture stress. Pick young at golf-to-tennis-ball size and keep watering consistent for sweet, crisp flesh.
• Splitting — Sudden water after a dry spell bursts the swelling stem. Mulch and water evenly; 'Winner' is more split-resistant but not immune.
• Flea beetles — Tiny beetles riddle young leaves with shot-holes, stunting seedlings. Use floating row cover at emergence and keep plants vigorous to grow through damage.
• Cabbage root fly — Larvae tunnel the stem base and stunt or kill young plants. Fit brassica collars at the stem or net plants to block egg-laying females.

Propagation

Seed only. Sow 1 cm deep direct or transplant young seedlings at 15-20 cm spacing. Make successional sowings every few weeks; sow in spring and late summer, avoiding the hottest midsummer period. 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

Kohlrabi 'Winner' is pet-safe. Kohlrabi (Brassica oleracea) is not individually listed as toxic to cats or dogs by the ASPCA, and small amounts of cooked brassica vegetable are generally safe for dogs. Large amounts of raw cruciferous matter can cause flatulence, GI upset and goitrogenic effects, so feed only sparingly. 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.

Kohlrabi 'Winner' deep-dive guides

Every aspect of kohlrabi 'winner' care, each with its own calibrated guide:

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

Featured in these plant shortlists

Kohlrabi 'Winner' qualifies for 1 curated Growli shortlist — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best pet-safe low-maintenance plants — Non-toxic to cats and dogs and forgiving of forgotten watering — the easiest safe choices for a busy pet household.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

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Kohlrabi 'Winner' is also commonly called Winner kohlrabi or white kohlrabi.

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