Onion

Allium cepa

Layer 6 · Roots
Edible companion

Status by region

No restrictions recorded in the lists we checked.

Checked against the European Union list (Regulation 1143/2014) · Portugal's national invasive species list (Decreto-Lei 92/2019).

Information based on the cited sources, not legal advice — always confirm your local rules.

About

One of humanity's oldest cultivated plants, the onion is indispensable in any kitchen garden or companion planting. It grows well in well-drained soils rich in organic matter exposed to the sun. Its strong aroma helps repel various insects harmful to neighbouring crops.

It is harvested now — September is one of the harvest months.

See which trees onion grows well with

These trees share this species' soil and climate — the pairing is inferred from conditions, not from a guild we have already seen.

Cork oak

No account needed.

Needs

Water: Medium
Light: Full sun
Size: Herbaceous up to 0.5 m
Mature diameter: 0.2 m
Soils: Loam, Sandy
Climates: Atlantic coast, Inland / Continental, Hot, dry Mediterranean

Calendar

January
February — Planting
March — Planting
April
May
June — Harvest
July — Harvest
August — Harvest
September — Harvest
October — Planting
November — Planting
December

Harvest
Planting

Medicinal use: The bulbs are consumed raw or cooked, possessing antiseptic, expectorant and cardiovascular action.

Where to buy

Central trees worth considering

May work well together — same soil and climate, complementary layers. We have not seen this combination in a generated guild yet.

Cork oak

May grow well with

Suggestions worked out from growing conditions — same soil and climate, complementary layers and functions. These are not observed guilds; treat them as a starting point to try on your own land.