Customer Service Hours
Mon-Fri 8-4 MST
Features
Family
Alliaceae (formerly Liliaceae) Allium or Onion family, includes onions, garlic, chives, shallots, and leeks.
Native
Exists only in cultivation
Life Cycle
Biennial grown as an annual
Plant Height
Large, softball-sized bulbs up to 1lb each
Further Information
Plant Resistance
- Bolt Resistant
- Pink Root Resistant
- Split Resistant
About Onion
Allium cepa
Planting Onion
Plant Spacing
A group of 2 seeds every 4"
Light Required
Full sun
Plant Height
Large, softball-sized bulbs up to 1lb each
Planting Depth
¼"
Planting Details
| Row Spacing | 12" ‒ 16" |
|---|---|
| Seed Depth | ¼" |
| Seed Spacing | A group of 2 seeds every 4" |
| Thinning | When 2" tall, thin to 1 every 4" |
| Germination | 7 ‒ 15 days |
| Start Indoors | Mild Climates only: 10 to 12 weeks before your average first fall frost date. Transplant outside no later than 6 weeks before your average first fall frost date. Ideal soil temperature is 60°–85°F. |
| Direct Sow | Mild Climates only: Late summer or early fall. Mid-October is the recommended, traditional sowing period. |
| Special Care | Keep growing area weed-free. Onion size can decrease 4% per day if competing with weeds‒that’s 50% in 2 weeks. If bulb pushes itself out of the ground, you may cover it lightly with straw, but not soil, as soil will prevent the onion bulb from forming properly. |
| Growing & Harvesting | When onion tops have fallen over and turned yellow or brown, they are ready for harvest. Harvest in the morning, lifting onions with a garden fork. Dry them in the garden in the sun for 2 to 3 days, lightly covering the bulbs with straw, or the tops of other onions to prevent sunscald. Cure onions for 3 to 7 days in a dry area with good air circulation. Once dry, cut the roots to 1/4", and the greens to 1" to create a seal, preventing decay. |
Find Your Frost Date & Grow Zone
Average First Frost Date
October 19
Average Last Frost Date
May 19
Your Hardiness Zone is
5b
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