Vegetables
Green Onion
A narrow, space-efficient crop for troughs, window boxes, and repeated small harvests.
Allium fistulosum
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Photo: Dalgial / CC BY-SA 3.0
At a glance
- Difficulty
- beginner
- Maintenance
- low
- Time to harvest
- 45–70 days · from-seed
- Water need
- moderate
- Growth habit
- upright clump
- Indoor suitability
- good
- 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
- 3 hours
- Minimum container depth
- 12 cm (≈ 4.7 in)
- Minimum container volume
- 3 L (≈ 0.8 US gal)
- Active growth range
- 2–28 °C (≈ 35.6–82.4 °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
- 4–7 hours
- Ideal temperature
- 5–25 °C (≈ 41–77 °F)
- Preferred depth
- 15–25 cm (≈ 5.9–9.8 in)
- Preferred volume
- 4–10 L (≈ 1.1–2.6 US gal)
- Drainage
- well drained
Overview
A narrow, space-efficient crop for troughs, window boxes, and repeated small harvests.
What makes it practical
Sow in short rows or small clusters, leaving enough space to reach the soil when watering.
What limits success
At least 3 hours of direct light; provide at least 12 cm of container depth and avoid treating the minimum as the preferred setup.
Getting started
Sow in short rows or small clusters, leaving enough space to reach the soil when watering.
Before planting
Prepare a container with open drainage and enough volume for the plant's mature root system. The documented minimum is 3 litres.
Planting
Sow in short rows or small clusters, leaving enough space to reach the soil when watering.
Position
Aim for 4–7 hours of direct light while watching for heat reflected from walls or glass.
Ongoing care
Keep growing steadily with useful light and even moisture; weak light makes leaves thin and floppy.
Watering check
This crop's water need is moderate. Check the mix itself instead of watering by a fixed weekday schedule.
Harvesting
Pull whole plants when stems reach useful size or snip a few leaves without stripping every plant.
Timing
The documented range is roughly 45–70 days from seed; temperature and cultivar can shift it.
Beginner mistakes
Regrowing kitchen scraps gives a short second flush but is not a substitute for a rooted, well-fed crop.
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 not enough light as a useful first diagnostic path.
Frequently asked questions
- How much light and root room does green onion need?
Green Onion needs at least 3 hours of direct light. It needs a container at least 12 cm deep holding about 3 litres. A 15–25 cm container with 4–10 litres is easier to keep evenly watered. Expect roughly 45–70 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 Isn’t Getting Enough Light
Recognize weak-light growth and compare actual direct-light hours with the plant's documented minimum.