Vegetables
Radish
A fast root crop that shows beginners quickly whether light, spacing, and soil moisture are working.
Raphanus sativus
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Photo: Enric / CC BY-SA 4.0
At a glance
- Difficulty
- beginner
- Maintenance
- low
- Time to harvest
- 21–35 days · from-seed
- Water need
- moderate
- Growth habit
- compact root crop
- 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
- 15 cm (≈ 5.9 in)
- Minimum container volume
- 4 L (≈ 1.1 US gal)
- Active growth range
- 4–24 °C (≈ 39.2–75.2 °F)
- Frost behaviour
- tolerant
Conditions it prefers
These conditions improve performance, but there may be room to adapt within the hard limits above.
- Ideal direct light
- 5–7 hours
- Ideal temperature
- 7–21 °C (≈ 44.6–69.8 °F)
- Preferred depth
- 18–25 cm (≈ 7.1–9.8 in)
- Preferred volume
- 6–12 L (≈ 1.6–3.2 US gal)
- Drainage
- well drained
Overview
A fast root crop that shows beginners quickly whether light, spacing, and soil moisture are working.
What makes it practical
Direct sow into loose mix because transplanted radishes can form distorted roots.
What limits success
At least 4 hours of direct light; provide at least 15 cm of container depth and avoid treating the minimum as the preferred setup.
Getting started
Direct sow into loose mix because transplanted radishes can form distorted roots.
Before planting
Prepare a container with open drainage and enough volume for the plant's mature root system. The documented minimum is 4 litres.
Planting
Direct sow into loose mix because transplanted radishes can form distorted roots.
Position
Aim for 5–7 hours of direct light while watching for heat reflected from walls or glass.
Ongoing care
Thin seedlings promptly and keep moisture even so roots expand instead of becoming woody or split.
Watering check
This crop's water need is moderate. Check the mix itself instead of watering by a fixed weekday schedule.
Harvesting
Pull a test root when shoulders become visible; small varieties become pithy if left too long.
Timing
The documented range is roughly 21–35 days from seed; temperature and cultivar can shift it.
Beginner mistakes
Dense sowing produces leaves without useful roots because each plant lacks space to swell.
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 slow growth as a useful first diagnostic path.
Frequently asked questions
- How much light and root room does radish need?
Radish needs at least 4 hours of direct light. It needs a container at least 15 cm deep holding about 4 litres. A 18–25 cm container with 6–12 litres is easier to keep evenly watered. Expect roughly 21–35 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
Explore vegetables
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
My Plant Is Barely Growing
Check useful light, temperature, root room, and recent growth before adding fertilizer to a plant that has stalled.