~Jonathon. Don’t Ever Plant Anything But Heirloom Seeds If you cover the plants with multiple layers, lettuce can survive down to 0 degrees Fahrenheit or -18 degrees Celsius. learn more about Coastal Star lettuce from Johnny’s Selected Seeds. The ideal soil temperature for germination though, is 70 to 75 F. In cooler temperatures, germination takes longer. Lettuce seeds are another leafy vegetable that is easy and quick to grow. The best soil temperature for lettuce germination is 60 to 86 degrees Fahrenheit (16 to 30 degrees Celsius). For the best results, keep the temperature around 55° Fahrenheit (12.7° Celsius) at night and around 75° Fahrenheit (23.8° Celsius) during the day. At night, on the other hand, you need to keep the temperature at about 50 to 60 degrees Celsius. (3 Things To Know), link to Are Onions Heat Tolerant? Lettuce is adapted to cool growing conditions with the optimum temperatures for growth of 60 to 65°F. The time for lettuce seed germination will vary, depending on soil temperature. The ideal temperature range for lettuce seed germination is 60 to 86 degrees Fahrenheit (16 to 30 degrees Celsius). You can learn more about lean-to trellises and other designs in my article here. Let's solve your gardening problems, spend more time growing, and get the best harvest every year! Temperatures above that point quickly facilitate bolting. The best time to plant the seeds is during cool weather. The ideal temperature for growth of lettuce plants is 55 to 65 degrees Fahrenheit (13 to 18 degrees Celsius). Just click the "Read More" button to the right. Celery is a Mediterranean plant that grows best in temperate climates with temperatures between 59 and 70° Fahrenheit (15-21° Celsius). 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. A cloche is a clear plastic or glass cover used to protect plants from cold, pests, and wind. They can grow in … That would be 77 degrees Fahrenheit. The right temperature is anywhere from 60 to 70 degrees Fahrenheit. The lettuce will still grow after it has started to bolt. The soil should be kept moist at all times during the germination period. If the soil is any warmer than this, germination rates will decrease. However, the leaves of lettuce will become bitter after the plant has bolted, to the point where the leaves will be inedible. To grow onions, you will need the right conditions, including light and temperature. 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. We’ll also get into ways you can protect lettuce from cold weather and how to prevent bolting in warm weather. Shade cloth is another method you can use to keep lettuce cooler. Although lettuce can survive a hard frost, this assumes that the plant has proper conditioning. to read some of my most popular posts, check out the “Best of GreenUpSide” page here. There’s no ideal climate for all lettuce types, but most grow best in cool weather. Lettuce is a cool-weather crop and a garden favorite, since it is the basis of many delicious salads. Leafy Lettuces. 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 Lettuce seedlings are available at farmer's markets, nurseries and home garden centers, and lettuce also can be grown through direct seeding in the soil of a garden bed or growing container. Since a cloche is clear, it still allows sunlight in so that plants can continue to grow. learn more about cloches in my article here. There is nothing I love more than heading out to my garden to pick fresh, crisp greens and bringing it indoors to make a salad. (Plus 7 Heat Tolerant Varieties). Growing lettuce in containers allows you to place the plants outdoors during good weather and move them inside to protect them in severe weather. Lettuce can tolerate a few days of temperatures from 80 to 85°F, provided that nights are cool. As an added bonus, shade cloth can protect lettuce from birds. Some small seeds are difficult to plant – carrots, lettuce, and onions come to mind. Water and light are fundamental to the process of lettuce seed germination. 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. 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. For example, you can leave extra space between your tomato plants and put a head of lettuce between every pair of tomato plants. Hi, I'm Jon. Now you know the ideal temperature ranges for lettuce germination and growth. Lettuce is a cool weather crop, so it prefers cooler temperatures for its growth. Water temperature and effects on hydroponics What is the best water temperature for plants? For extra early crops, start plants inside 3 to 4 weeks before transplanting. This is a normal part of a lettuce plant’s life cycle. When temperatures dip below 2 degrees celsius, consider covering plants with a row cover, cloche or other apparatus. 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. According to the Michigan State University Extension, lettuce is a plant that is hardy to hard frost. Finally, keep harvesting your lettuce as soon as the leaves are ready (or even when they are still a bit small!) 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. If direct seeding, scatter the lettuce seeds lightly and evenly over a moist, but not soaking wet, soil surface. 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. The maximum temperature for lettuce seed germination is 85 degrees Fahrenheit (29.4 degrees Celsius). When temperatures are warmer than 70 to 75 F, lettuce seed may not germinate. So, what is the best temperature for growing lettuce? 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”. learn more about Magenta lettuce from Johnny’s Selected Seeds. Leaves wilt, toughen, and get bitter if the plant becomes water stressed in heat. learn more about Winter Density lettuce from Johnny’s Selected Seeds. When a sudden hard frost threatens, your lettuce might be able to survive. 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. Children will see the seeds sprout and get their first leaves, then their real leaves and grow to harvest—what an excellent activity for the whole family. ... Are Onions Heat Tolerant? 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. A hard frost is defined as a temperature less than 28 degrees Fahrenheit (-2 degrees Celsius). When the weather gets warmer, lettuce will start to “bolt” or go to seed. The best temperature for growing lettuce is from 55 up to 70 degrees Fahrenheit (12.8 to 21.1 degrees Celsius). If you want to take extra steps to protect your plants, you have a few options. Experts say lettuce is one of the easiest vegetables to grow in your garden. So plant more seeds than the number of lettuce plants you need. Lettuce can survive in temperatures down to 10 degrees Fahrenheit or -12 degrees Celsius. This shade cloth from Gardener’s Supply Company can be used with hoops for support. For example, you can bend a flexible plastic rod into a half-circle and drive the two ends into the ground. learn more about Adriana lettuce from Johnny’s Selected Seeds. Row covers can provide a few degrees of cold protection for your lettuce. 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. However, it also means that the lettuce leaves will become bitter, to the point where most people would not enjoy eating them. This makes the leaves inedible to anyone with taste buds. Lettuce seeds can germinate just fine at higher temperatures that would cause established lettuce plants to bolt (produce seeds and become bitter). Keep lettuce plants protected, either by cold frames, hoops or tunnels. Frost damage on leafy vegetables doesn't render the plant inedible like a disease. As there are many varieties of lettuce, make sure you choose the ones that tolerate heat and grows well in tropical conditions. Thin to one or two plants per pot. (Plus 7 Heat Tolerant Varieties). As with many crops, there are differences between varieties within the same species. Harvested fruit and vegetables are living organisms. If you harvest your lettuce as it matures, you can extend your growing season by at least a few days. Suitable air temperatures range from 12 – 21C, with 18C the optimum. It’s past its prime. Lettuce is a cool-season crop that prefers temperatures of 55 to 65 °F for optimum growth. 5. There is an ideal temperature range for growing lettuce, and extreme cold or heat will lead to poor growth or bitter leaves. 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. As the cucumbers grow, they will provide shade for the lettuce. Growing Lettuce in an AeroGarden is a fantastic way to get your children involved and use the leaves to make their salad sandwiches. All types of lettuce grow best when the soil is kept constantly moist, and outside temperatures range between 45 and 75 degrees Fahrenheit. Enjoy! It grows in any location with the sun and you can start indoors. For instance, in some areas, people go on about how nothing lives through the summer once it gets beyond temperature x. After germination, the ideal temperature for growing lettuce is 55 to 65 degrees Fahrenheit (13 to 18 degrees Celsius). Growing your own lettuce is a beautiful thing. Just remember that lettuce do need some sunlight, so don’t leave your plants covered all day in heavy shade. I hope you found this article helpful. If you want to read some of my most popular posts, check out the “Best of GreenUpSide” page here. But what happens when temperatures dip toward the freezing mark? The ideal temperature for growth of lettuce plants is 55 to 65 degrees Fahrenheit (13 to 18 degrees Celsius). However, this isn’t the only way to do it. 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. Be careful when hardening-off plants not to expose them to cold temperatures. Want to learn how to plant sprouted potatoes to grow your own food? Another option is to plant vining crops, such as cucumbers, at the bottom of a lean-to trellis. If so, please share it with someone who can use the information. The optimum soil temperature for seed germination is 60 to 8… As the tomato plants grow, they will provide some shade for the lettuce. Intense sunlight for 12 to … You can learn more about cloches in my article here. If, however, you plan to harvest only small, tender leaves, then you can have more plants with less space between them. Take care that the temperature is not too high as lettuce starts to seed quickly under the influence of very hot temperature. What Are Pelleted Seeds? During germination, the first root and shoot of lettuce emerge from the seed and move downward and upward, respectively. For example, lettuce seeds can still germinate in soil close that is close to freezing, but it will take several weeks to do so. Use this chart to determine if the soil temperature in the garden is right for seed starting the crop you want to plant. © Copyright 2020 Hearst Communications, Inc. A row cover is a piece of fabric material that protects plants against cold and pests. Lettuce. Depending on the grade of the shade cloth, it can provide up to 10 degrees of heat protection for your lettuce! based on information from the University of California Extension. 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