Let's solve your gardening problems, spend more time growing, and get the best harvest every year! The ideal temperature for growth of lettuce plants is 55 to 65 degrees Fahrenheit (13 to 18 degrees Celsius). Best Germination Temp: Best Night Growing Temp: Best Day Growing Temp: Geraniums: 75°F: 50-60°F: 65-75°F: Hydrangeas: Best from cuttings: 60°F: 70°F: Beets: 50-85°F: NA: 60-65°F: Carrots: 50-85°F: NA: 40-85°F: Lettuce: 65-75°F: 60-70°F: 60-70°F To grow onions, you will need the right conditions, including light and temperature. Lettuce thrives in the cool spring season so it requires planting in early spring once soil temperatures are above 60 degrees Fahrenheit. Most cool season crops germinate at maximum soil temperatures of 90 degrees, except for lettuce and spinach, which require temperatures … Grow above 70 F during the day and above 60 F at night. ... Are Onions Heat Tolerant? Choose a spot that receives a minimum of four to six hours of direct, full sunlight each day. Lettuce seeds can germinate just fine at higher temperatures that would cause established lettuce plants to bolt (produce seeds and become bitter). However, it also means that the lettuce leaves will become bitter, to the point where most people would not enjoy eating them. University of Illinois Extension: Lettuce, North Carolina State University: Lettuce Production, University of Arizona: Seed to Seed -- Fresh Produce Safety, How to Sprout Lettuce Seeds in Hot Weather. The lettuce will still grow after it has started to bolt. Since a cloche is clear, it still allows sunlight in so that plants can continue to grow. A cloche is a clear plastic or glass cover used to protect plants from cold, pests, and wind. Most will check both the maximum temperature (usually during the day) and the minimum temperature (at night), so leave them in place for 24 hours for a complete picture. Not only is it rewarding to pick your own fresh produce, but once picked, lettuce will continue to grow, giving you successive harvests of fresh greens. If the soil is any warmer than this, germination rates will decrease. Hi, I'm Jon. (Plus 7 Heat Tolerant Varieties). Temperatures above that point quickly facilitate bolting. Lettuce is a cool-season crop that prefers temperatures of 55 to 65 °F for optimum growth. based on information from the University of California Extension. Take care that the temperature is not too high as lettuce starts to seed quickly under the influence of very hot temperature. According to the Michigan State University Extension, lettuce is a plant that is hardy to hard frost. The table below summarizes the temperature ranges for lettuce growth. One of the best ways to grow lettuce for a longer time period in a hot climate is too choose a heat-tolerant lettuce variety. Just remember that lettuce do need some sunlight, so don’t leave your plants covered all day in heavy shade. Temperatures inside a covered seed tray will be closer to the maximum temperature reading and, unless the spot cools off considerably at night, will remain quite stable, a further factor to consider. So plant more seeds than the number of lettuce plants you need. that you can provide. For example, there are many heat-tolerant lettuce varieties that can withstand warmer temperatures than their cousins before they begin to bolt (more on these varieties later). The time for lettuce seed germination will vary, depending on soil temperature. Plant when soil temperatures warm up to 35 to 40 degrees F. In general, cool season crops can be planted two weeks before the last frost date. Plants with one or two true leaves transplant best. This vegetable gives higher yield when the temperature is maintained no higher than fifteen to twenty degrees Celsius. Leafy Lettuces. The best temperature for growing lettuce is from 55 up to 70 degrees Fahrenheit (12.8 to 21.1 degrees Celsius). You can harvest non-damage parts by cutting away brown areas and edges that are frost damaged and save just the leaf parts that are uninjured and your plant will continue to grow. Depending on its variety, lettuce seed can germinate when the soil temperature is 35 to 80 degrees Fahrenheit. Lettuce is a crop that grows better in a cooler environment. Lettuce is adapted to cool growing conditions with the optimum temperatures for growth of 60 to 65°F. A row cover is a piece of fabric material that protects plants against cold and pests. Not all seeds germinate and lead to plants. For extra early crops, start plants inside 3 to 4 weeks before transplanting. If so, please share it with someone who can use the information. (3 Things To Know). For example, you can bend a flexible plastic rod into a half-circle and drive the two ends into the ground. On the other hand, if the weather gets progressively cooler over a long time period, lettuce will be able to survive cold down into the 20’s Fahrenheit (-6 to -2 Celsius). (The upper temperature limit to grow heading lettuces is 28°C/83F) (3 Things To Know), link to Are Onions Heat Tolerant? Here are some types of heat-tolerant lettuce from Johnny’s Selected Seeds: Any lettuce that gets partial shade during the hottest part of the day will take longer to bolt. Lettuce seed often refuses to germinate if the temperature is above 80 F. During hot weather, you can start lettuce seed indoors under lights, if your home has air conditioning. Use a handful of pine needles around tender seedlings to help prevent wind damage and also provide support. The following methods will all help with this to some degree (no pun intended!). Suitable air temperatures range from 12 – 21C, with 18C the optimum. For instance, in some areas, people go on about how nothing lives through the summer once it gets beyond temperature x. Lettuce is a cool weather crop, so it prefers cooler temperatures for its growth. If the lettuce gets too hot it will bolt, or flower, which isn’t good because this will create a bitter taste in the lettuce leaves. At night, on the other hand, you need to keep the temperature at about 50 to 60 degrees Celsius. To grow lettuce in hot climates, you will need a way to keep the lettuce a bit cooler. Of course, if the temperature is too high or too low, lettuce seeds will fail to germinate. But what happens when temperatures dip toward the freezing mark? During germination, the first root and shoot of lettuce emerge from the seed and move downward and upward, respectively. Enjoy! Want to learn how to plant sprouted potatoes to grow your own food? Are there varieties of iceberg lettuce and cabbages that can grow on low altitudes of less than 1000 feet and temperatures ranging 28 to 33 degrees Celsius along the equator (tropical climate) Ali April 26, 2018 Thin to one or two plants per pot. Pelleted seeds make it much easier to sow the smallest seeds.So, what are pelleted seeds? I don't know of any plants that die just because it's 40° C. (104° F.) You can learn more about cloches in my article here. Another option is to plant vining crops, such as cucumbers, at the bottom of a lean-to trellis. learn more about Cherokee lettuce from Johnny’s Selected Seeds. If they are growing in a warmer environment they will think that it is already summer and thus start producing seeds, which means that they will not be edible anymore (well you could eat it, but the taste will be horrible). Keep lettuce plants protected, either by cold frames, hoops or tunnels. If direct seeding your lettuce seeds, thin the plants after they reach the seedling stage by pulling out some of the seedlings to leave enough space between the remaining plants. In fact, according to the Texas A&M University Extension, lettuce can even survive a frost or hard freeze, as long as the cold does not come suddenly after warm weather. a hydroponic lettuce is still a growing plant with roots and leaves, an onion or potato can re-sprout and grow into a new plant under the right conditions). If, however, you plan to harvest only small, tender leaves, then you can have more plants with less space between them. Lettuce can survive in temperatures down to 10 degrees Fahrenheit or -12 degrees Celsius. For example, you can leave extra space between your tomato plants and put a head of lettuce between every pair of tomato plants. learn more about lean-to trellises and other designs in my article here. Celery is a Mediterranean plant that grows best in temperate climates with temperatures between 59 and 70° Fahrenheit (15-21° Celsius). As the cucumbers grow, they will provide shade for the lettuce. ~Jonathon. The maximum temperature for lettuce seed germination is 85 degrees Fahrenheit (29.4 degrees Celsius). In a natural environment cannabis does not thrive submerged in water: it prefers alternate wet/dry climate (which we replicate with the wet dry cycle when growing in soil or coco-perlite) in order to drag oxygen into its root system and thereby into the plant. Growing Lettuce in an AeroGarden is a fantastic way to get your children involved and use the leaves to make their salad sandwiches. Lettuce can tolerate a few days of temperatures from 80 to 85°F, provided that nights are cool. Growing your own lettuce is a beautiful thing. Frost damage on leafy vegetables doesn't render the plant inedible like a disease. If you want to read some of my most popular posts, check out the “Best of GreenUpSide” page here. If direct seeding, scatter the lettuce seeds lightly and evenly over a moist, but not soaking wet, soil surface. 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 ideal soil temperature for germination though, is 70 to 75 F. In cooler temperatures, germination takes longer. First, you can plant your lettuce next to taller plants. 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. Shade cloth still allows some light to get through, which means that your lettuce will still be able to grow. You can protect an entire row of lettuce plants from cold by using a row cover. If the temperature becomes too warm or too cool for lettuce plants to grow well outside, they can be moved indoors permanently as long as they have enough light. Space these half-circles a couple of feet apart in a row and you can cover them with a row cover, giving you a miniature “hoop house”. © Copyright 2020 Hearst Communications, Inc. Luckily, there are a few different ways to provide shade for your lettuce. This can make the difference for their survival when extreme cold is on the horizon. Advisers at the University of Illinois Extension say the best planting temperature is fifteen degrees Celsius. Use this chart to determine if the soil temperature in the garden is right for seed starting the crop you want to plant. All types of lettuce grow best when the soil is kept constantly moist, and outside temperatures range between 45 and 75 degrees Fahrenheit. Benjamin Shorter has been a writer for publications such as the "New Brunswick Telegraph-Journal," "National Post" and the "Edmonton Journal" since 2001. If the lettuce leaves get large enough, the plant will think it is “done” growing, and will enter the next phase of its life: producing seeds. 10. Conditioning means that the plant has had time to grow accustomed to cooler temperatures, instead of being subjected to extreme cold all at once. In this article, we’ll talk about the ideal temperatures for lettuce germination and growth. You can learn more about lean-to trellises and other designs in my article here. Now you know the ideal temperature ranges for lettuce germination and growth. Note that this can vary depending on the variety of lettuce and any heat protection (shade cloth, etc.) 35°F, but the task has some environmental requirements degrees Celcius along a row cover after has... 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