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. A cloche acts as a mini greenhouse, trapping heat from sunlight in the air and soil underneath it. There is an ideal temperature range for growing lettuce, and extreme cold or heat will lead to poor growth or bitter leaves. 5. Water temperature and effects on hydroponics What is the best water temperature for plants? This can make the difference for their survival when extreme cold is on the horizon. Use a handful of pine needles around tender seedlings to help prevent wind damage and also provide support. 10. Lettuce thrives in the cool spring season so it requires planting in early spring once soil temperatures are above 60 degrees Fahrenheit. You also know how to protect lettuce from temperature extremes to extend your harvest. Growing your own lettuce is a beautiful thing. You can also make a cloche out of wire (such as chicken or rabbit wire), although this will not provide cold protection by itself. You can combine two or more of these methods to keep your lettuce even cooler and extend the season to enjoy a longer harvest. Suitable air temperatures range from 12 – 21C, with 18C the optimum. As there are many varieties of lettuce, make sure you choose the ones that tolerate heat and grows well in tropical conditions. You can make a cloche out of a clear plastic bottle by cutting out the bottom and using the cap on top as a vent. Lettuce seedlings should be protected from the wind because the young plants are rapidly dried out. Germinating lettuce seeds is not difficult, but the task has some environmental requirements. Use this chart to determine if the soil temperature in the garden is right for seed starting the crop you want to plant. that you can provide. If you want to take extra steps to protect your plants, you have a few options. Lettuce. The apical meristem of young lettuce plants is near the soil surface, so plant growth is often more closely matched to soil temperature than air temperature. Take care that the temperature is not too high as lettuce starts to seed quickly under the influence of very hot temperature. Of course, if the temperature is too high or too low, lettuce seeds will fail to germinate. They can grow in … Just remember that lettuce do need some sunlight, so don’t leave your plants covered all day in heavy shade. 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). Lettuce is adapted to cool growing conditions with the optimum temperatures for growth of 60 to 65°F. So plant more seeds than the number of lettuce plants you need. Then, plant lettuce below the trellis. 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. Although lettuce can survive a hard frost, this assumes that the plant has proper conditioning. Lettuce is a cool-weather crop and a garden favorite, since it is the basis of many delicious salads. Harvested fruit and vegetables are living organisms. Combined with high humidity, high temperatures can encourage the growth of mold, which is another threat to your plants. The table below summarizes the temperature ranges for lettuce growth. All types of lettuce grow best when the soil is kept constantly moist, and outside temperatures range between 45 and 75 degrees Fahrenheit. If you want to read some of my most popular posts, check out the “Best of GreenUpSide” page here. Leaves wilt, toughen, and get bitter if the plant becomes water stressed in heat. But what happens when temperatures dip toward the freezing mark? I don't know of any plants that die just because it's 40° C. (104° F.) The best temperature for growing lettuce is from 55 up to 70 degrees Fahrenheit (12.8 to 21.1 degrees Celsius). As with many crops, there are differences between varieties within the same species. learn more about lean-to trellises and other designs in my article here. One way to use row covers is to first install supports along a row and then drape the row cover over the supports. Be careful when hardening-off plants not to expose them to cold temperatures. This vegetable gives higher yield when the temperature is maintained no higher than fifteen to twenty degrees Celsius. Lettuce may bolt in response to the stress of high temperatures, and the leaves may become bitter as the plant puts its growth into flowering (see photo at right). Lettuce seeds are small, so … The maximum temperature for lettuce seed germination is 85 degrees Fahrenheit (29.4 degrees Celsius). When the weather gets warmer, lettuce will start to “bolt” or go to seed. Lettuce is a cool-season crop that prefers temperatures of 55 to 65 °F for optimum growth. Frost damage on leafy vegetables doesn't render the plant inedible like a disease. The right temperature is anywhere from 60 to 70 degrees Fahrenheit. ~Jonathon. According the North Carolina State University Extension, lettuce will start to bolt (flower and make seeds) at daytime temperatures of 70 to 80 degrees Fahrenheit (21 to 27 degrees Celsius). Growing lettuce in containers allows you to place the plants outdoors during good weather and move them inside to protect them in severe weather. Advisers at the University of Illinois Extension say the best planting temperature is fifteen 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. ... (e.g. The best time to plant the seeds is during cool weather. Lettuce seeds typically sprout in two to eight days when soil temperatures range between 12 to 17 degrees Celcius. How to Grow Celery. If direct seeding, scatter the lettuce seeds lightly and evenly over a moist, but not soaking wet, soil surface. A row cover is a piece of fabric material that protects plants against cold and pests. Lettuce is a cool weather crop, so it prefers cooler temperatures for its growth. That is, the plant will start to grow tall and produce flowers, which will eventually produce seeds. Thin to one or two plants per pot. 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. For example, if a hard frost comes suddenly after warm weather, then lettuce may not survive. Once a lettuce plant starts to produce seeds, the leaves will become bitter. This makes the leaves inedible to anyone with taste buds. 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). Most lettuce varieties germinate well in the range of 10 to 15 degrees Celsius making them an excellent winter crop for gardeners in temperate areas. Water and light are fundamental to the process of lettuce seed germination. Choose a spot that receives a minimum of four to six hours of direct, full sunlight each day. When temperatures dip below 2 degrees celsius, consider covering plants with a row cover, cloche or other apparatus. If so, please share it with someone who can use the information. We’ll also get into ways you can protect lettuce from cold weather and how to prevent bolting in warm weather. Does your lettuce need to be protected from frost? Hi, I'm Jon. However, it also means that the lettuce leaves will become bitter, to the point where most people would not enjoy eating them. Intense sunlight for 12 to … Let's solve your gardening problems, spend more time growing, and get the best harvest every year! Seed will germinate at temperatures between the minimum soil temperature and the optimum soil temperatures, but the number of days to germination will be greater. 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 Finally, keep harvesting your lettuce as soon as the leaves are ready (or even when they are still a bit small!) Lettuce is a cool weather crop, so it will bolt (grow tall, then produce flowers and seeds) in high temperatures. However, to achieve best results, it is recommended that lettuce be grown on sandy loam soil and clay loam soil. © Copyright 2020 Hearst Communications, Inc. The ideal temperature range for lettuce seed germination is 60 to 86 degrees Fahrenheit (16 to 30 degrees Celsius). Regulating the temperature is another good way to improve the health of the plant. Day length affects onion growth and bulb development, but onion temperature tolerance depends on the... link to What Are Pelleted Seeds? Ideal Temperature for Lettuce to Grow. (Plus 7 Heat Tolerant Varieties). The best temperature for growing lettuce will depend on the growth stage. The University of Illinois Extension say the best soil temperature for germination though, is 70 75°F! Two or more of these methods to keep lettuce plants you need know ideal! 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