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. Since a cloche is clear, it still allows sunlight in so that plants can continue to grow. Growing lettuce in containers allows you to place the plants outdoors during good weather and move them inside to protect them in severe weather. It grows in any location with the sun and you can start indoors. To grow lettuce in hot climates, you will need a way to keep the lettuce a bit cooler. Does your lettuce need to be protected from frost? The best temperature for growing lettuce is from 55 up to 70 degrees Fahrenheit (12.8 to 21.1 degrees Celsius). Lettuce can survive in temperatures down to 10 degrees Fahrenheit or -12 degrees Celsius. Growing Lettuce in Extreme Summer Heat – In a Vegepod! You can protect an entire row of lettuce plants from cold by using a row cover. Once a lettuce plant starts to produce seeds, the leaves will become bitter. learn more about Jericho lettuce from Johnny’s Selected Seeds. 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. For instance, in some areas, people go on about how nothing lives through the summer once it gets beyond temperature x. Although lettuce can survive a hard frost, this assumes that the plant has proper conditioning. First, you can plant your lettuce next to taller plants. 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. Lettuce seeds are another leafy vegetable that is easy and quick to grow. The lettuce will still grow after it has started to bolt. All lettuce varieties are considered cool-season vegetables. During germination, the first root and shoot of lettuce emerge from the seed and move downward and upward, respectively. Enjoy! The best temperature for growing lettuce will depend on the growth stage. Of course, if the temperature is too high or too low, lettuce seeds will fail to germinate. Lettuce can tolerate a few days of temperatures from 80 to 85°F, provided that nights are cool. Celery is a Mediterranean plant that grows best in temperate climates with temperatures between 59 and 70° Fahrenheit (15-21° Celsius). Frost damage on leafy vegetables doesn't render the plant inedible like a disease. Shade cloth is a mesh material that filters out some of the sunlight to keep plants beneath it cooler. If you want to read some of my most popular posts, check out the “Best of GreenUpSide” page here. 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. What Are Pelleted Seeds? Enjoy! Plants with one or two true leaves transplant best. It’s past its prime. The ideal temperature range for lettuce seed germination is 60 to 86 degrees Fahrenheit (16 to 30 degrees Celsius). 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. If so, please share it with someone who can use the information. Experts say lettuce is one of the easiest vegetables to grow in your garden. learn more about Cherokee lettuce from Johnny’s Selected Seeds. 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. Growing Lettuce in an AeroGarden is a fantastic way to get your children involved and use the leaves to make their salad sandwiches. You can learn more about cloches in my article here. The right temperature is anywhere from 60 to 70 degrees Fahrenheit. Temperature and light to grow lettuce Average room temperature of 16 to 21 degree Celsius is best for growing lettuce. If, however, you plan to harvest only small, tender leaves, then you can have more plants with less space between them. How to Grow Celery. This vegetable gives higher yield when the temperature is maintained no higher than fifteen to twenty degrees Celsius. Lettuce seedlings should be protected from the wind because the young plants are rapidly dried out. 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. Growing your own lettuce is a beautiful thing. Lettuce seeds can germinate just fine at higher temperatures that would cause established lettuce plants to bolt (produce seeds and become bitter). 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. Lettuce is adapted to cool growing conditions with the optimum temperatures for growth of 60 to 65°F. Most cool season crops germinate at maximum soil temperatures of 90 degrees, except for lettuce and spinach, which require temperatures … Water and light are fundamental to the process of lettuce seed germination. 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. Then, plant lettuce below the trellis. Sow 3 seeds per pot in 2-inch pots. You can also make a cloche out of wire (such as chicken or rabbit wire), although this will not provide cold protection by itself. The ideal temperature for growth of lettuce plants is 55 to 65 degrees Fahrenheit (13 to 18 degrees Celsius). Growing lettuce indoors results in a steady supply of fresh, leafy greens throughout summer or even year-round if you wish. Harvested fruit and vegetables are living organisms. This makes the leaves inedible to anyone with taste buds. The optimum soil temperature for seed germination is 60 to 8… For extra early crops, start plants inside 3 to 4 weeks before transplanting. For example, you can leave extra space between your tomato plants and put a head of lettuce between every pair of tomato plants. In this article, we’ll talk about the ideal temperatures for lettuce germination and growth. Lettuce is a crop that grows better in a cooler environment. 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”. 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. 10. 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. According to the Michigan State University Extension, lettuce is a plant that is hardy to hard frost. that you can provide. According to the Michigan State University Extension, lettuce is a plant that is hardy to hard frost. Just click the "Read More" button to the right. The maximum temperature for lettuce seed germination is 85 degrees Fahrenheit (29.4 degrees Celsius). Lettuce seeds typically sprout in two to eight days when soil temperatures range between 12 to 17 degrees Celcius. When a sudden hard frost threatens, your lettuce might be able to survive. Temperatures above that point quickly facilitate bolting. However, to achieve best results, it is recommended that lettuce be grown on sandy loam soil and clay loam soil. 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. I don't know of any plants that die just because it's 40° C. (104° F.) That is, the plant will start to grow tall and produce flowers, which will eventually produce seeds. A cloche acts as a mini greenhouse, trapping heat from sunlight in the air and soil underneath it. If you see an elongated crown on the lettuce plant, pull it up and compost. (Plus 7 Heat Tolerant Varieties). You also know how to protect lettuce from temperature extremes to extend your harvest. 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. Take care that the temperature is not too high as lettuce starts to seed quickly under the influence of very hot temperature. 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. Depending on its variety, lettuce seed can germinate when the soil temperature is 35 to 80 degrees Fahrenheit. Pelleted seeds make it much easier to sow the smallest seeds.So, what are pelleted seeds? Lettuce is a cool weather crop, so it prefers cooler temperatures for its growth. Lettuce may grow on different kinds of soil. Use this chart to determine if the soil temperature in the garden is right for seed starting the crop you want to plant. As an added bonus, shade cloth can protect lettuce from birds. There’s no ideal climate for all lettuce types, but most grow best in cool weather. Depending on its variety, lettuce seed can germinate when the soil temperature is 35 to 80 degrees Fahrenheit. This shade cloth from Gardener’s Supply Company can be used with hoops for support. For example, lettuce seeds can still germinate in soil close that is close to freezing, but it will take several weeks to do so. 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). As with many crops, there are differences between varieties within the same species. Lettuce is a cool weather crop, so it prefers cooler temperatures for its growth. At night, on the other hand, you need to keep the temperature at about 50 to 60 degrees Celsius. Hi, I'm Jon. The table below summarizes the temperature ranges for lettuce growth. Choose a spot that receives a minimum of four to six hours of direct, full sunlight each day. (The upper temperature limit to grow heading lettuces is 28°C/83F) © Copyright 2020 Hearst Communications, Inc. Intense sunlight for 12 to … learn more about cloches in my article here. (3 Things To Know). learn more about Coastal Star lettuce from Johnny’s Selected Seeds. The following methods will all help with this to some degree (no pun intended!). Just remember that lettuce do need some sunlight, so don’t leave your plants covered all day in heavy shade. 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. Keep lettuce plants protected, either by cold frames, hoops or tunnels. If you want to take extra steps to protect your plants, you have a few options. Shade cloth is another method you can use to keep lettuce cooler. ... Are Onions Heat Tolerant? Luckily, there are a few different ways to provide shade for your lettuce. Suitable air temperatures range from 12 – 21C, with 18C the optimum. Want to learn how to plant sprouted potatoes to grow your own food? Regulating the temperature is another good way to improve the health of the plant. Lettuce germination and early growth rates are largely determined by temperature. 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. The time for lettuce seed germination will vary, depending on soil temperature. based on information from the University of California Extension. The best soil temperature for lettuce germination is 60 to 86 degrees Fahrenheit (16 to 30 degrees Celsius). learn more about Magenta lettuce from Johnny’s Selected Seeds. Row covers can provide a few degrees of cold protection for your lettuce. Let's solve your gardening problems, spend more time growing, and get the best harvest every year! However, it also means that the lettuce leaves will become bitter, to the point where most people would not enjoy eating them. The best time to plant the seeds is during cool weather. For example, you can bend a flexible plastic rod into a half-circle and drive the two ends into the ground. ~Jonathon. You can combine two or more of these methods to keep your lettuce even cooler and extend the season to enjoy a longer harvest. Leafy Lettuces. ... (e.g. 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. We’ll also get into ways you can protect lettuce from cold weather and how to prevent bolting in warm weather. Now you know the ideal temperature ranges for lettuce germination and growth. The soil should be kept moist at all times during the germination period. Depending on the grade of the shade cloth, it can provide up to 10 degrees of heat protection for your lettuce! 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. learn more about Winter Density lettuce from Johnny’s Selected Seeds. A row cover is a piece of fabric material that protects plants against cold and pests. 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. 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. Shade cloth still allows some light to get through, which means that your lettuce will still be able to grow. Water temperature and effects on hydroponics What is the best water temperature for 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. 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. 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). So plant more seeds than the number of lettuce plants you need. 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). Ideal Temperature for Lettuce to Grow. When temperatures dip below 2 degrees celsius, consider covering plants with a row cover, cloche or other apparatus. to read some of my most popular posts, check out the “Best of GreenUpSide” page here. We used the following techniques to successfully grow lettuce … This crop prefers a loamy soil with a high organic matter content. Lettuce is a cool-weather crop and a garden favorite, since it is the basis of many delicious salads. If you harvest your lettuce as it matures, you can extend your growing season by at least a few days. When temperatures are warmer than 70 to 75 F, lettuce seed may not germinate. Lettuce seeds are small, so … To grow onions, you will need the right conditions, including light and temperature. A cloche is a clear plastic or glass cover used to protect plants from cold, pests, and wind. A cool-weather vegetable, lettuce (Lactuca sativa) has many varieties, and they all germinate and grow best in cool temperatures, such as those in U.S. Department of Agriculture plant hardiness zones 4 through 9. All types of lettuce grow best when the soil is kept constantly moist, and outside temperatures range between 45 and 75 degrees Fahrenheit. After germination, the ideal temperature for growing lettuce is 55 to 65 degrees Fahrenheit (13 to 18 degrees Celsius). They can grow in … As there are many varieties of lettuce, make sure you choose the ones that tolerate heat and grows well in tropical conditions. Combined with high humidity, high temperatures can encourage the growth of mold, which is another threat to your plants. 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). This shade cloth from Gardener’s Supply Company can be used with hoops for support. learn more about lean-to trellises and other designs in my article here. (Plus 7 Heat Tolerant Varieties). Frosts, freezing temperatures and snow will not kill them. Lettuce is a cool-season crop that prefers temperatures of 55 to 65 °F for optimum growth. 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. Leaves wilt, toughen, and get bitter if the plant becomes water stressed in heat. Advisers at the University of Illinois Extension say the best planting temperature is fifteen degrees Celsius. I hope you found this article helpful. Not all seeds germinate and lead to plants. So, what is the best temperature for growing lettuce? A hard frost is defined as a temperature less than 28 degrees Fahrenheit (-2 degrees Celsius). Day length affects onion growth and bulb development, but onion temperature tolerance depends on the... link to What Are Pelleted Seeds? Germinating lettuce seeds is not difficult, but the task has some environmental requirements. 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. The ideal temperature for growth of lettuce plants is 55 to 65 degrees Fahrenheit (13 to 18 degrees Celsius). 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. 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 There is an ideal temperature range for growing lettuce, and extreme cold or heat will lead to poor growth or bitter leaves. The ideal soil temperature for germination though, is 70 to 75 F. In cooler temperatures, germination takes longer. That would be 77 degrees Fahrenheit. At 70 to 80°F, the plants flower and produce seed. Thin to one or two plants per pot. 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). Some small seeds are difficult to plant – carrots, lettuce, and onions come to mind. If you want the lettuce to develop fully grown heads, then leave 10 to 12 inches between the seedlings. Conditioning means that the plant has had time to grow accustomed to cooler temperatures, instead of being subjected to extreme cold all at once. But what happens when temperatures dip toward the freezing mark? When the weather gets warmer, lettuce will start to “bolt” or go to seed. If the soil is any warmer than this, germination rates will decrease. Be careful when hardening-off plants not to expose them to cold temperatures. As the cucumbers grow, they will provide shade for the lettuce. 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. You would need to drape a frost blanket or piece of row cover over the cloche to insulate the plant. (3 Things To Know), link to Are Onions Heat Tolerant? Lettuce is a cool weather crop, so it will bolt (grow tall, then produce flowers and seeds) in high temperatures. Note that this can vary depending on the variety of lettuce and any heat protection (shade cloth, etc.) 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. Another option is to plant vining crops, such as cucumbers, at the bottom of a lean-to trellis. However, lettuce loves the cool weather (80 degrees F or less) and is challenging to grow … learn more about Muir lettuce from Johnny’s Selected Seeds. Storage temperatures for fruits and vegetables. Lettuce thrives in the cool spring season so it requires planting in early spring once soil temperatures are above 60 degrees Fahrenheit. Finally, keep harvesting your lettuce as soon as the leaves are ready (or even when they are still a bit small!) This can make the difference for their survival when extreme cold is on the horizon. Grow above 70 F during the day and above 60 F at night. This is a normal part of a lettuce plant’s life cycle. However, this isn’t the only way to do it. He holds a Bachelor of Arts in history from McGill University, a Master of Arts in history from Central European University and a diploma in journalism from Concordia University. Use a handful of pine needles around tender seedlings to help prevent wind damage and also provide support. 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. 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). 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. As the tomato plants grow, they will provide some shade for the lettuce. 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