Onion
SpeciesAllium cepa
Also called onion plant, Allium cepa L.
Connections
Fact sheet
every fact quoted from its source“The bulbs are composed of shortened, compressed, underground stems” — Onion - Wikipedia
“which usually takes about 7 to 10 days after planting” — 13 Onion Growing Stages: A Complete Guide | October 2026 | Just Pure Gardening
“The onion plant takes approximately 90 to 120 days to reach full maturity from planting to harvesting.” — 13 Onion Growing Stages: A Complete Guide | October 2026 | Just Pure Gardening
“Onion seeds need warm soil to germinate. The ideal soil temperature for germination is 65-75 oF” — 13 Onion Growing Stages: A Complete Guide | October 2026 | Just Pure Gardening
“Regardless of whether you choose seeds or bulbs, selecting an area with loose, well-draining soil and full sun for successful onion growth is a must.” — 13 Onion Growing Stages: A Complete Guide | October 2026 | Just Pure Gardening
“Onion seeds also need moisture to germinate. The soil should be moist but not soggy.” — 13 Onion Growing Stages: A Complete Guide | October 2026 | Just Pure Gardening
“prefer pH levels between 6-6.8” — Onion soil requirements | Wikifarmer
“USDA hardiness zones 4-10” — Onion soil requirements | Wikifarmer
“Place each bulb in a hole 4 to 6 inches (10 to 15 cm) apart” — 13 Onion Growing Stages: A Complete Guide | October 2026 | Just Pure Gardening
from Green onion · “Harvest when the green tops reach 6 to 8 inches in height.” — How Long Do Green Onions Take To Grow? Diagnostic Guide
“By seed (directly sown/seeding on the field) By transplanting seedlings” — Onion soil requirements | Wikifarmer
“When to Plant: Early spring or fall” — 23 Best Onion Companion Plants (with Chart) & 7 to Avoid | RASNetwork GardeningExpandExpandSearchSearchToggle MenuFacebo
from Green onion · “Harvest when the green tops reach 6 to 8 inches in height.” — How Long Do Green Onions Take To Grow? Diagnostic Guide
from Green onion · “Cut the green tops with scissors, leaving the roots intact for regrowth.” — How Long Do Green Onions Take To Grow? Diagnostic Guide
“The crop is harvested and dried and the onions are ready for use or storage” — Onion - Wikipedia
Who grows this
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14 cultivars
Where this comes from
- Name and place in the family tree: GBIF Backbone Taxonomy (CC BY 4.0)
- Linked record: Wikidata (CC0)
- Wikipedia: Onion
- Fact sheet: 5 source pages, read and quoted by the OmniGrowers Librarian