![]() ![]() 7 Heat Tolerant Onion Varietiesīunching onions are more heat tolerant than other varieties. The table below summarizes the ideal temperature ranges for onions at various stages of growth. Intermediate Day (Day Neutral) – these onions produce bulbs regardless of day length.Īfter you harvest and cure onions, they will store best at temperatures of 40 to 50 degrees Fahrenheit (4 to 10 degrees Celsius). ![]() They grow best in Zone 6 & cooler (Northern U.S.) Long Day – these onions need 14 to 15 hours of daylight to produce bulbs.They grow best in Zone 7 & warmer (Southern U.S.) Short Day – these onions need 10 hours of daylight to produce bulbs.Of course, heat tolerance also depends on the type of onion and the location where it is grown. Mature onions may spoil in cool fall weather, so be sure to plan ahead.Ĭhoose the appropriate onion varieties, based on the length of your growing season and your location. If you plant onions too late in the season (or plant a variety that takes a long time to mature), they will experience cool temperatures in the fall. To complete their growth and form bulbs, onions need temperatures of at least 70 to 75 degrees Fahrenheit. That means they can survive in cooler climates, and they can even tolerate some frost. Join 1000 like-minded gardeners and get access to news, tips, and information.ĭelivered right to your inbox each Friday. (If you want a complete seed starting walkthrough with video and other resources, check out our seed starting course today!) We’ll also look at heat tolerant onion varieties and how to protect onions from heat. In this article, we’ll talk about how heat and day length affect onions. Of course, it helps to know which onion varieties are heat tolerant and how to protect other varieties from heat. You can protect onions from high temperatures by using shade cloth to reduce the heat from intense sunlight. However, certain types of onions are more heat tolerant, such as bunching onions. So, are onions heat tolerant? Onions are a cool weather crop, so they are not as heat tolerant as tropical plants, such as tomatoes and peppers. Day length affects onion growth and bulb development, but onion temperature tolerance depends on the variety. To grow onions, you will need the right conditions, including light and temperature. ![]()
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