Vegetables
Kale
A cold-tolerant leafy crop that can supply repeated harvests from one well-spaced container plant.
Brassica oleracea var. sabellica
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Photo: Σ64 / CC BY 4.0
At a glance
- Difficulty
- beginner
- Maintenance
- moderate
- Time to harvest
- 55–80 days · from-seed
- Water need
- moderate
- Growth habit
- upright leafy stem
- Indoor suitability
- possible
- Support
- Usually not required
What this plant must have
These are minimum limits, not aspirational targets. Missing one can prevent healthy growth.
- Minimum direct light
- 4 hours
- Minimum container depth
- 25 cm (≈ 9.8 in)
- Minimum container volume
- 10 L (≈ 2.6 US gal)
- Active growth range
- 0–26 °C (≈ 32–78.8 °F)
- Frost behaviour
- hardy
Conditions it prefers
These conditions improve performance, but there may be room to adapt within the hard limits above.
- Ideal direct light
- 5–8 hours
- Ideal temperature
- 3–23 °C (≈ 37.4–73.4 °F)
- Preferred depth
- 30–40 cm (≈ 11.8–15.7 in)
- Preferred volume
- 15–25 L (≈ 4–6.6 US gal)
- Drainage
- well drained
Overview
A cold-tolerant leafy crop that can supply repeated harvests from one well-spaced container plant.
What makes it practical
Give each mature plant enough width rather than filling a pot with seedlings that will compete later.
What limits success
At least 4 hours of direct light; provide at least 25 cm of container depth and avoid treating the minimum as the preferred setup.
Getting started
Give each mature plant enough width rather than filling a pot with seedlings that will compete later.
Before planting
Prepare a container with open drainage and enough volume for the plant's mature root system. The documented minimum is 10 litres.
Planting
Give each mature plant enough width rather than filling a pot with seedlings that will compete later.
Position
Aim for 5–8 hours of direct light while watching for heat reflected from walls or glass.
Ongoing care
Inspect leaf undersides for pests and keep growth steady with even moisture.
Watering check
This crop's water need is moderate. Check the mix itself instead of watering by a fixed weekday schedule.
Harvesting
Take lower outer leaves first while leaving the central crown to continue producing.
Timing
The documented range is roughly 55–80 days from seed; temperature and cultivar can shift it.
Beginner mistakes
Ignoring small caterpillar holes can allow damage to spread quickly across the tender center leaves.
A useful reset
Change one condition at a time, then judge the newest growth rather than expecting damaged leaves to recover.
Troubleshooting context
Start with the visible symptom and rule out moisture, light, temperature, and root-room conflicts before assuming disease.
Relevant symptom
The launch troubleshooting library links this plant to pests as a useful first diagnostic path.
Frequently asked questions
- How much light and root room does kale need?
Kale needs at least 4 hours of direct light. It needs a container at least 25 cm deep holding about 10 litres. A 30–40 cm container with 15–25 litres is easier to keep evenly watered. Expect roughly 55–80 days from seed, which shifts with temperature and cultivar.
Editorial review:
Reviewed by NookHarvest Editorial Team
How we review adviceCorrections and questionsProblems and next steps
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Vegetables
Set up the container
Container Gardening
Choose pots, mix, drainage, and plant combinations that make small-space care more forgiving.
Troubleshoot a likely symptom
Something Is Eating the Leaves
Inspect both sides of leaves and identify the type of damage before deciding whether a pest treatment is warranted.
Small Insects Are Clustering on New Growth
Clusters of soft-bodied insects, curled tips, or sticky residue