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洋葱的适应性广,种子、鳞茎和幼苗均具有较强的耐低温能力,在3～5℃下能缓慢发芽,12℃以上发芽快。幼苗期生长适温12～20℃,健壮幼苗能耐-7～6℃低温。叶生长适温18～20℃,鳞茎膨大期要求20～26℃较高温度,长日照和较高温度利于鳞茎的形成。洋葱为低温感应型作物,多数品种在2～5℃时通过春化。不同品种对日照长短反应不同,长日照品种必须有13.5～15小时长日照才能形成鳞茎,北方品种属长日照型,且多晚熟。
Onions have wide adaptability, seeds, bulbs and seedlings all have strong ability of low temperature resistance. They can germinate slowly at 3 ~ 5 ℃ and germinate faster than 12 ℃. Seedling growth suitable temperature 12 ~ 20 ℃, robust seedlings capable of -7 ~ 6 ℃ low temperature. Leaf growth suitable temperature 18 ~ 20 ℃, bulging bulbs require 20 ~ 26 ℃ higher temperature, long sunshine and higher temperatures conducive to the formation of bulbs. Onion is a low-temperature sensitive crop, most varieties through 2 ~ 5 ℃ vernalization. Different varieties of different length of the response to the sun, long-day varieties must have 13.5 to 15 hours long sunlight to form bulbs, northern varieties are long-day type, and more late maturing.