Onions are straightforward to develop from seed, however you have to begin early. Within the Northern Hemisphere, sow onion seeds indoors in January and February, outdoor in April or Could.
Onion bulb formation and daylight
Onion bulb formation is influenced by the size of daylight and the hours of darkish every day. So-called long-day onions type bulbs when daylight grows longer in spring than the darkness of evening. Quick-day onions type bulbs when the hours of evening and day are almost equal or when nighttime hours are longer than sunlight hours.
Plant long-day onion varieties in northern areas and short-day onion varieties in southern areas. Daylight in northern areas grows longer than nights as summer time approaches, and daylight grows shorter in southern areas as summer time approaches.
Backyard facilities generally carry the suitable onion varieties for the gardeners of their area.
Onion planting time and harvest
Onions began from seed indoors in late winter ought to type bulbs for summer time harvest. Onions began from seed within the backyard in mid to late spring could be grown as summer-bunching onions or fall-storage onions.
Onion seeds germinate greatest at 65℉ to 80℉ (18℃ to 27℃), however younger vegetation needs to be grown in cooler temperatures, close to 60℉ (16℃) and never hotter than 70℉ (21℃) by day and 50℉ (10℃) by evening.
Onion planting dates for summer time harvest
(These dates are for the Northern Hemisphere)
| Common date of the final frost | Planting dates |
| Jan. 30 | Jan. 1-15 |
| Feb. 8 | Jan. 1-15 |
| Feb. 18 | Jan. 1-15 |
| Feb. 28 | Jan. 1-Feb. 1 |
| Mar. 10 | Jan. 15-Feb. 15 |
| Mar. 20 | Feb. 10-Mar. 10 |
| Mar. 30 | Feb. 20-Mar. 15 |
| Apr. 10 | Mar. 1-Apr. 1 |
| Apr. 20 | Mar. 1-Apr. 1 |
| Apr. 30 | Mar. 15-Apr. 15 |
| Could 10 | Apr. 1-Could 1 |
| Could 20 | Apr. 20-May15 |
| Could 30 | Could 1-30 |
| June 10 | Could 10-June 10 |
Onion planting particulars
- Sowing depth: ½ inch (1.2 cm)
- House between plant after thinning: 3-4 inches (7.6-10cm)
- Days to sprout: 10; begin seed indoors 4 to six weeks earlier than setting transplants within the backyard
- Days to reap: 95-130
- Storage interval: 12-32 weeks
- Seeds per 100 row toes: ½ ounce (14 grams)
- Yield per 100 row toes: 100 kilos (45 kilos)
- Urged varieties: Verify at a backyard middle or name the cooperative extension for varieties suited to your location.
- Be aware: Management weeds whil vegetation are spindly and defenseless.
Associated articles of curiosity:
Rising Onion Bulbs: Decide the Proper Selection for Your Backyard