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Plant library

Allium · Cool/Warm season

Onions

Bulb onion

Sun

Full sun (6–8+ hrs)

Water

Moderate; keep moisture even

Spacing

4–6 in

Difficulty

Easy–Moderate

Planting and care

How to grow onions

When to grow

Cool/Warm season · Annual

How to start

Seed, sets, transplants or cloves

Mature size

Upright foliage 8–24 in

Time to harvest

About 45–120+ days; garlic commonly overwintered

Feeding needs

Moderate feeder

Growth habit

Allium

Harvest and kitchen use

Cooking, seasoning, fresh garnish and storage depending type

Nutrition and garden value

Vitamin C and sulfur-containing compounds

Narrow upright growth makes good use of bed edges and gaps

Common challenges and troubleshooting

Thrips, bulb rot and poor drainage