🧅
Onion
vegetable
At a glance
- USDA Zones
- 3–9
- Sun
- Full sun (6+ hrs)
- Water
- Medium — water when top inch of soil is dry
- Soil
- loam, sandy
- pH
- neutral
- Spacing
- 4 in. between plants
- SFG per sq ft
- 9 plants per 1-ft cell
- Days to maturity
- ~100 days
Planting & harvest windows
Northern Hemisphere timing. Adjust ±4–6 weeks based on your last/first frost dates.
| Activity | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Plant | ||||||||||||
| Harvest |
Plant Harvest
Good companions
- 🍅
- 🥕Carrot
Onion smell confuses the carrot fly; the strong scents mask each other's pest cues.
- 🥬
- 🍓
Keep apart from
Recommended varieties
- Walla Walla Sweet110 daysstart
Mild, juicy sweet onion. Best in long-day zones.
- Texas Sweet (Granex)100 daysstart
Famous Vidalia-type — short-day, for southern beds.
- Red Burgundy100 daysstart
Mild red onion, beautiful in salads.
Add Onion to your raised bed — the planner handles spacing and companion warnings automatically.
Open the planner →