Then, plant lettuce below the trellis. Storage temperatures for fruits and vegetables. Lettuce seeds are small, so … 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. 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. Lettuce is adapted to cool growing conditions with the optimum temperatures for growth of 60 to 65°F. (3 Things To Know), link to Are Onions Heat Tolerant? It grows in any location with the sun and you can start indoors. That would be 77 degrees Fahrenheit. Hi, I'm Jon. The best temperature for growing lettuce is from 55 up to 70 degrees Fahrenheit (12.8 to 21.1 degrees Celsius). Lettuce seeds are another leafy vegetable that is easy and quick to grow. (Plus 7 Heat Tolerant Varieties). Lettuce. Once a lettuce plant starts to produce seeds, the leaves will become bitter. Or you can store your seeds in your refrigerator, and cool the soil down in the garden bed for a few days before planting (water the soil well, and cover it with a heavy mulch or burlap). As the tomato plants grow, they will provide some shade for the lettuce. 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. Use this chart to determine if the soil temperature in the garden is right for seed starting the crop you want to plant. When temperatures are warmer than 70 to 75 F, lettuce seed may not germinate. Lettuce seed will germinate at 35°F, but optimum germination is 70 to 75°F. Lettuce is a crop that grows better in a cooler environment. 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). 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. 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. (The upper temperature limit to grow heading lettuces is 28°C/83F) 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 I don't know of any plants that die just because it's 40° C. (104° F.) At 70 to 80°F, the plants flower and produce seed. 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. 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. At night, on the other hand, you need to keep the temperature at about 50 to 60 degrees Celsius. Growing lettuce indoors results in a steady supply of fresh, leafy greens throughout summer or even year-round if you wish. Of course, if the temperature is too high or too low, lettuce seeds will fail to germinate. 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. For example, if a hard frost comes suddenly after warm weather, then lettuce may not survive. You can combine two or more of these methods to keep your lettuce even cooler and extend the season to enjoy a longer harvest. In this temperature range, lettuce seed takes only 2 to 4 days to germinate. As an added bonus, shade cloth can protect lettuce from birds. The ideal temperature range for lettuce seed germination is 60 to 86 degrees Fahrenheit (16 to 30 degrees Celsius). 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. For example, you can leave extra space between your tomato plants and put a head of lettuce between every pair of tomato plants. It’s past its prime. Now you know the ideal temperature ranges for lettuce germination and growth. Enjoy! Germinating lettuce seeds is not difficult, but the task has some environmental requirements. Frosts, freezing temperatures and snow will not kill them. Harvested fruit and vegetables are living organisms. Ideal Temperature for Lettuce to Grow. Lettuce seeds typically sprout in two to eight days when soil temperatures range between 12 to 17 degrees Celcius. In other areas, it's considered the peak of the growing season when it's temperature x, and the same kinds of plants seem to thrive. Luckily, there are a few different ways to provide shade for your lettuce. The optimum soil temperature for seed germination is 60 to 8… If you see an elongated crown on the lettuce plant, pull it up and compost. 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. learn more about Winter Density lettuce from Johnny’s Selected Seeds. that you can provide. learn more about Cherokee lettuce from Johnny’s Selected Seeds. learn more about cloches in my article here. 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. (Plus 7 Heat Tolerant Varieties). The ideal temperature for growth of lettuce plants is 55 to 65 degrees Fahrenheit (13 to 18 degrees Celsius). This shade cloth from Gardener’s Supply Company can be used with hoops for support. You can also make a cloche out of wire (such as chicken or rabbit wire), although this will not provide cold protection by itself. One way to use row covers is to first install supports along a row and then drape the row cover over the supports. According to the Michigan State University Extension, lettuce is a plant that is hardy to hard frost. So, what is the best temperature for growing lettuce? 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. Be careful when hardening-off plants not to expose them to cold temperatures. 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 ideal temperature for growth of lettuce plants is 55 to 65 degrees Fahrenheit (13 to 18 degrees Celsius). Temperature and light to grow lettuce Average room temperature of 16 to 21 degree Celsius is best for growing lettuce. Lettuce may grow on different kinds of soil. Although lettuce can survive a hard frost, this assumes that the plant has proper conditioning. If you want to read some of my most popular posts, check out the “Best of GreenUpSide” page here. 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-season crop that prefers temperatures of 55 to 65 °F for optimum growth. Growing Lettuce in an AeroGarden is a fantastic way to get your children involved and use the leaves to make their salad sandwiches. Depending on the grade of the shade cloth, it can provide up to 10 degrees of heat protection for your lettuce! 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. However, to achieve best results, it is recommended that lettuce be grown on sandy loam soil and clay loam soil. This is a normal part of a lettuce plant’s life cycle. As the cucumbers grow, they will provide shade for the lettuce. The ideal soil temperature for germination though, is 70 to 75 F. In cooler temperatures, germination takes longer. Intense sunlight for 12 to … 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”. Some small seeds are difficult to plant – carrots, lettuce, and onions come to mind. You can learn more about cloches in my article here. The soil should be kept moist at all times during the germination period. This crop prefers a loamy soil with a high organic matter content. to read some of my most popular posts, check out the “Best of GreenUpSide” page here. After germination, the ideal temperature for growing lettuce is 55 to 65 degrees Fahrenheit (13 to 18 degrees Celsius). Regulating the temperature is another good way to improve the health of the plant. Plants with one or two true leaves transplant best. If, however, you plan to harvest only small, tender leaves, then you can have more plants with less space between 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). For extra early crops, start plants inside 3 to 4 weeks before transplanting. Growing your own lettuce is a beautiful thing. Choose a spot that receives a minimum of four to six hours of direct, full sunlight each day. Just remember that lettuce do need some sunlight, so don’t leave your plants covered all day in heavy shade. ~Jonathon. Shade cloth is another method you can use to keep lettuce cooler. That is, the plant will start to grow tall and produce flowers, which will eventually produce seeds. based on information from the University of California Extension. learn more about lean-to trellises and other designs in my article here. Lettuce thrives in the cool spring season so it requires planting in early spring once soil temperatures are above 60 degrees Fahrenheit. This vegetable gives higher yield when the temperature is maintained no higher than fifteen to twenty degrees Celsius. learn more about Jericho lettuce from Johnny’s Selected Seeds. ... (e.g. That said, when growing lettuce hydroponically you should ensure that the day temperatures range between 20 and 23 degrees Celsius and never at any point exceeding 25 degrees Celsius. First, you can plant your lettuce next to taller plants. 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. The best temperature for growing lettuce will depend on the growth stage. A cloche acts as a mini greenhouse, trapping heat from sunlight in the air and soil underneath it. Shade cloth still allows some light to get through, which means that your lettuce will still be able to grow. 5. The first step is to choose lettuce that will work with you to resist bolting in the heat, so we’ll start with heat-tolerant lettuce varieties. Sow 3 seeds per pot in 2-inch pots. Want to learn how to plant sprouted potatoes to grow your own food? I hope you found this article helpful. If you want the lettuce to develop fully grown heads, then leave 10 to 12 inches between the seedlings. A cloche is a clear plastic or glass cover used to protect plants from cold, pests, and wind. ... Are Onions Heat Tolerant? learn more about Coastal Star lettuce from Johnny’s Selected Seeds. Most cool season crops germinate at maximum soil temperatures of 90 degrees, except for lettuce and spinach, which require temperatures … When a sudden hard frost threatens, your lettuce might be able to survive. For instance, in some areas, people go on about how nothing lives through the summer once it gets beyond temperature x. Benjamin Shorter has been a writer for publications such as the "New Brunswick Telegraph-Journal," "National Post" and the "Edmonton Journal" since 2001. As with many crops, there are differences between varieties within the same species. According to the Michigan State University Extension, lettuce is a plant that is hardy to hard frost. Enjoy! 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. learn more about Muir lettuce from Johnny’s Selected Seeds. When temperatures dip below 2 degrees celsius, consider covering plants with a row cover, cloche or other apparatus. There is an ideal temperature range for growing lettuce, and extreme cold or heat will lead to poor growth or bitter leaves. 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. For example, lettuce seeds can still germinate in soil close that is close to freezing, but it will take several weeks to do so. How to Grow Celery. The maximum temperature for lettuce seed germination is 85 degrees Fahrenheit (29.4 degrees Celsius). Celery is a Mediterranean plant that grows best in temperate climates with temperatures between 59 and 70° Fahrenheit (15-21° Celsius). Leaves wilt, toughen, and get bitter if the plant becomes water stressed in heat. 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 During germination, the first root and shoot of lettuce emerge from the seed and move downward and upward, respectively. You can learn more about lean-to trellises and other designs in my article here. learn more about Magenta lettuce from Johnny’s Selected Seeds. They can grow in … This can make the difference for their survival when extreme cold is on the horizon. Growing Lettuce in Extreme Summer Heat – In a Vegepod! For example, you can bend a flexible plastic rod into a half-circle and drive the two ends into the ground. If direct seeding, scatter the lettuce seeds lightly and evenly over a moist, but not soaking wet, soil surface. © Copyright 2020 Hearst Communications, Inc. Tip: Harvest sooner rather than later to avoid a bitter lettuce flavor. However, lettuce loves the cool weather (80 degrees F or less) and is challenging to grow … Lettuce can survive in temperatures down to 10 degrees Fahrenheit or -12 degrees Celsius. All lettuce varieties are considered cool-season vegetables. If you harvest your lettuce as it matures, you can extend your growing season by at least a few days. 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. Lettuce is a cool-weather crop and a garden favorite, since it is the basis of many delicious salads. The right temperature is anywhere from 60 to 70 degrees Fahrenheit. However, this isn’t the only way to do it. When the weather gets warmer, lettuce will start to “bolt” or go to seed. 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. However, the leaves of lettuce will become bitter after the plant has bolted, to the point where the leaves will be inedible. Another option is to plant vining crops, such as cucumbers, at the bottom of a lean-to trellis. 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. 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. Row covers can provide a few degrees of cold protection for your lettuce. 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. Just click the "Read More" button to the right. Pelleted seeds make it much easier to sow the smallest seeds.So, what are pelleted seeds? Note that this can vary depending on the variety of lettuce and any heat protection (shade cloth, etc.) 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). Leafy Lettuces. 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). 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