Seed Swaps

Onion care instructions

Allium cepa var. cepa

All care instructions and information about Onion (Allium cepa var. cepa) have been provided by real gardeners.

Lifecycle Is Onion annual or perennial?
Growing Difficulty How hard is it to grow Onion?
Very easy 1/5
Growth Habit What shape or habit does Onion grow into?
Hardiness How frost hardy is Onion?
Country of Origin Where did Onion come from?
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Mature Height How tall does Onion grow?
45.0 cm / 1.46 feet
Mature Spread How wide does Onion grow?
30.0 cm / 11.7 inches
USDA Zone Range Which zones does Onion grow best in?
Zone 3 to Zone 10
pH Range The level of acidity for Onion.
6.0 - 7.0
Water Requirements How much water does Onion require?
Nitrogen Requirements How much nitrogen fertilizer does Onion need?
Soil What sort of soil should I plant Onion in?
Loam / Clay / Sand
Sun How much sunlight does Onion need to grow?
Full Sun / Partial Sun
Can Sow Direct? Can Onion be sown directly?
Sowing Depth How deep to plant Onion?
2.5 cm / 0.98 inches
Sowing Distance Apart How far apart to plant Onion?
5.0 cm / 1.95 inches
Sowing Row Distance Apart How far apart to plant rows of Onion?
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Ideal Germination Temperature Range What temperatures does Onion need in order to germinate?
13°C / 55°F to 35°C / 95°F
Growing Temperatures What temperatures are best to grow Onion in?
8°C / 46°F to 28°C / 82°F
Planting Distance Apart How far apart to plant Onion seedlings.
10.0 cm / 3.9 inches
Planting Row Distance Apart How far apart to plant rows of Onion seedlings.
30.0 cm / 11.7 inches
Bloom Time When will Onion bloom?
Early Summer
Harvest Time When is Onion ready for harvest?
Early Autumn
Pruning Time When should I prune Onion?
Early Autumn