Lettuce is a cool weather crop, so it prefers cooler temperatures for its growth. The ideal temperature for growth of lettuce plants is 55 to 65 degrees Fahrenheit (13 to 18 degrees Celsius). The table below summarizes the temperature ranges for lettuce seed germination, in both Fahrenheit and Celsius temperatures, based on information from the University of California Extension. For example, lettuce seeds can still germinate in soil close that is close to freezing, but it will take several weeks to do so. The time for lettuce seed germination will vary, depending on soil temperature. Remember to keep the soil moist to encourage faster germination. Lettuce seeds germinate in only 2 to 4 days with soil temperatures of 60 to 86 degrees Fahrenheit. In this temperature range, lettuce seed takes only 2 to 4 days to germinate. The best soil temperature for lettuce germination is 60 to 86 degrees Fahrenheit (16 to 30 degrees Celsius). Lettuce seeds can germinate just fine at higher temperatures that would cause established lettuce plants to bolt (produce seeds and become bitter). The best temperature for growing lettuce will depend on the growth stage. What is the Best Temperature for Growing Lettuce? Join 1000 like-minded gardeners and get access to news, tips, and information.ĭelivered right to your inbox each Friday. We’ll also get into ways you can protect lettuce from cold weather and how to prevent bolting in warm weather. In this article, we’ll talk about the ideal temperatures for lettuce germination and growth. Lettuce is a cool weather crop, so it will bolt (grow tall, then produce flowers and seeds) in high temperatures. Of course, if the temperature is too high or too low, lettuce seeds will fail to germinate. After germination, the ideal temperature for growing lettuce is 55 to 65 degrees Fahrenheit (13 to 18 degrees Celsius). So, what is the best temperature for growing lettuce? The ideal temperature range for lettuce seed germination is 60 to 86 degrees Fahrenheit (16 to 30 degrees Celsius). There is an ideal temperature range for growing lettuce, and extreme cold or heat will lead to poor growth or bitter leaves. Lettuce is a cool-weather crop and a garden favorite, since it is the basis of many delicious salads.
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