Scallion (Green Onion) plant profile
Allium cepa
An annual vegetable for full sun.
Last updated .
When to plant
When to plant Scallion (Green Onion)
Scallions (green onions) are cool-season and quick. Sow seed or plant sets in early spring, and again in late summer for fall; sets are ready about 6 to 8 weeks after planting (Clemson).
The calendar shows this cited seasonal window as an approximate band. It does not convert the season into frost-adjusted dates.
Open Scallion (Green Onion) in my garden calendarShows the source-backed planting season, not frost-adjusted dates.
Growing conditions
- Sun
- Full sun
- Planting depth
- 0.5 in
- Soil pH
- 6.2 to 6.5
- Lifecycle
- Annual
- Spacing
- 1 to 2 in apart, rows 12 in
- Days to maturity
- 42 to 56 days (from transplant)
Common problems
Watch for these
Evidence trail
Evidence behind this profile
Original extension and institutional publications behind the planting, care, and safety facts on this page.
- Onion, Leek, Shallot, & Garlic (HGIC 1314)
Clemson Cooperative Extension Home & Garden Information Center. Supports general reference. Checked 2026-06-11.
- Toxic and Non-Toxic Plants: Onion (Allium cepa) entry
ASPCA Animal Poison Control Center. Supports pet-safety verdicts for dogs and cats. Checked 2026-07-18.