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[–] Grindelwo 0 points 2 points (+2|-0) ago 

like cool mild winter/spring weather in the early part of their growth, summer sunlight, water 65° to 77°F (18° to 25°C) no pests, no stormy weather, tolerate temperatures higher than 75°F. as long as soil has nutrient, cure on dry ground for a few days, weather permitting, not all are the same different type of Onions different 'species' grow better in different zones on our planet, go for a compost or manure or nitrate based fertilizer rather than a sulfate based fertilize soil