While typically germination occurs within 7 to 10 days, soil temperature affects this process. Time to Germination. Plant onion seeds indoors 8–10 weeks before transplanting them outside just before the average last frost date in your area. How long do onion seeds take to germinate? Seeds should be sown ¼ inch deep. Onions require an open and sunny site, fertile soil, and good drainage. From planting to harvest depends on the type and whether they were started from sets (50 to 60 days), seeds (110-125 days), or transplants (70 to 90 days). For instance, the cooler the soil temperature, the longer it will take for onion seeds to germinate up to 2 weeks. Harvest when one-forth to one-half of the tops of the onions have fallen down. When to Transplant For those of us that have a real winter, plant onions inside 8-10 weeks before your last frost date in spring (earlier is better). If you're in a milder area, you may be able to get away with starting onion seed directly in the garden. Optimum soil temperature to grow onions is … Seeds will germinate in 4-10 days when started indoors. Warm soil temperatures, on the other hand, can trigger onion seed germination … It is important to let the plants go dormant before harvesting because they … Growing Onions from Seeds. 4 to 10 daysSeeds should germinate in 4 to 10 days at an optimal temperature of 70°F (21°C) or thereabouts; germination will take longer in colder soil but germination can be slow in chilly soil.
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