The easiest way to do this is with a Hydrofarm Germination Station , which is a seedling heat mat, a standard flat, and a plastic dome that fits over the flat, for holding in humidity and keeping the temperature higher. the top tomato tips: Work from your final frost date to determine when to sow (mine’s late May-early June).Use my seed-starting calculator to get your start date (and a link to figure out your frost date if you don’t know it). Plant them ¼ inch (6 mm.) Maturing Tomatoes. To set fruit, tomatoes require night temperatures of … The best tomatoes to grow in cool or cold climates are short- to mid-season tomatoes—that is tomatoes that mature in the shortest number of days, 55 to about 75 days from transplanting. Tomato seeds should germinate and sprouts emerge at 75 - 80*F where possible. These very tender plants include cantaloupe, eggplant, peppers, and tomatoes. Ideal temperatures for germination are 70-80 degrees Fahrenheit. Learn how to plant tomato seeds, care for the seedlings, and ultimately transplant the tomato seedlings … Best to keep temperature range 70 to 80F (21 to 27C). The best range for most vegetable plants is between 75-85°F and flowers should be around 70°F. Temperature Growing Guide for Plants. Growing in a greenhouse is really the art of manipulating plants, and temperature is one tool to help with this, so the ideal temperature depends on what you want to do with the plants. Right Temperature. This could be a natural or artificial light source. This is a great time of year. One of the best things about vegetable gardening is eating a homegrown tomato. If temperature is kept consistently and sufficiently warm, your tomato seeds will usually germinate within 5 to 10 days. For tomatoes to thrive, they require about eight hours of sunlight per day. You can sow seed from late March to early April if you will be growing the plants outdoors. Easy to grow and very tasty in a sandwich, ready for a picnic. The lower the temperature the slower the germination. Seeds such as lettuce and peas germinate in cooler weather. Because the plants are heat lovers, most gardeners don't have growing seasons long enough to start tomatoes from seed outdoors. Temperature is also an important factor for direct sowing plants. Sow tomato seeds inside in seed starter mix. Keep the soil lightly moist and in a warm location to germinate. Although you can start your tomatoes on a sunny windowsill, you'll get better results growing them under some type of LED grow light . Direct sowing, too. Tomatoes are easy to grow from seed. deep in 6 inch (15 cm.) Set 8 to 10-week old tomato seedlings in the garden two weeks after the last frost in spring. Note: Some seeds require total darkness for germination. But even temperatures below 50 degrees Fahrenheit can stunt the plant's growth and might damage leaves. Transplanting leggy seedlings deeply helps them to root along their stems, thus reducing the problem, but the best solution is to give your young plants proper growing conditions in the first place. In temperate climates, it may be midsummer before the soil gets that warm, and by then it’s too late for tomatoes to grow and mature before the end of the growing season. Cherry tomato seeds can germinate at lower temperatures, but the larger salad and beefsteak tomatoes need temperatures of 75-90° (24-32° C) for strong, even germination. Warm soil stimulates tomato seeds to germinate faster than cooler earth. Manage Plant Growth: Your seedlings will grow best around 65F (18C) with gentle air circulation and lots of light. For a good reading, place the thermometer in the soil approximately 3″ deep (or however deep the tip allows) and allow a minute for a definite reading. 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