Onion
veg
Onion (standard)
Sets or transplants easier than seed for beginners.
Ordering identifiers
- SKU
- PLT-10014
- Barcode
- 08100010015
- Supplier / brand
- PlantIt Seed Co. · PlantIt Basics
- Packet size
- ~50 seeds
- Seeds per pack
- 50
- Germination %
- 100%
- Growth habit
- BUSH
- Sow method
- TRANSPLANT
- Plant spacing
- 4 inches
- Row spacing
- 5 inches
- Height / spread
- 12 / 4 in
- Light preference
- full sun
- Hardiness zones
- 3-9
- Temp preference
- warm season
- Germination temp
- 70–85°F
- Days to germinate
- 10 days
- Soil
- Well-drained, fertile soil; amend with compost.
- Days to transplant
- 56
- Days to harvest
- 100 (±20d window)
- Seed vs last frost
- -8 weeks
Garden size
Suited to: garden plot / in-ground · raised bed · container
Other info
- Direct sow: —
- Start indoors: Start indoors about 8 weeks before last frost.
- Transplant: Transplant at 56 days from sowing, after frost risk.
- Thin: Thin seedlings to 4" apart once true leaves appear.
Companions & antagonists
Plant with: Carrot, Lettuce, Tomato, Beet, Strawberry
Avoid near: Bush Beans, Peas
Water by environment
- Grow tent: Light frequent water early; reduce near maturity.
- Greenhouse: Even moisture until bulbs swell.
- Outdoors: 1 in/week; stop watering when tops fall.
Sample schedule (zone 7a, outdoors)
- Start indoors — Start indoors / under cover (indoors), 8 wk before last spring frost (Apr 4, 2027). Start indoors about 8 weeks before last frost.Feb 7
- Germinate — Expect germination (~10 days after sow)Feb 17
- Transplant — Transplant indoors → outdoors. After last spring frost (Apr 4, 2027 + -2 wk). Transplant at 56 days from sowing, after frost risk.Apr 4
- Harvest — Harvest window opens (~100 days after transplant; ~20 day window) (first fall frost ~Oct 23, 2027)Jul 13