Growing tomatoes in hot weather. If it is too hot, plant growth will slow down, and fruit will not set or form properly. If it is too cold, it may damage the tomato plant or its fruit. Consider supplemental lighting for tomato plants growing in a hothouse during winter months. Whenever it's over 90, be sure to give your plants plenty of water. Maintain the hothouse temperature between 60 to 90 degrees Fahrenheit, the range at which tomatoes set fruit. Those that live in very warm climates have had to deal with this aggravating fact in July and August as the tomatoes pretty much stop producing. You can grow a variety of warm loving plants in summer when a greenhouse is hot. Is it too hot for my little plant. Tropical plants like hot, sticky weather while xeriscaping (drough-tolerant) plants thrive in high-temperature climates that see little rain fall. Use a shade cloth if needed to prevent the hothouse from getting too hot, and a heater to keep the plants adequately warm during winter growing. Daytime temperatures consistently above 90° F or night time temperatures consistently above 75° F create all kinds of stress for tomato plants. When growing tomatoes, it helps to know the various temperature ranges for healthy plant growth. I sure like this remote thermometer but I do go crazy trying to grow tomatoes. What is hot and too hot? Both sets of plants are standout choices for enduring heat waves, as they're already adapted to those conditions. Although frost occurs, by definition, when the temperature drops to 0 ° C at 1.5 meters above the ground, this may or may not result in freeze damage to crops. How hot is too hot for tomato plants? It’s too hot for tomatoes to be pollinated. The Effect of Extreme Temperatures on the Tomato and Pepper Crop Freezing and chilling injury in tomato and pepper plants. That means fewer fruit. I’ve never tried to grow tomatoes in the Arabian desert, but I’ve grown plenty of them in Illinois and yeah, a consistent temperature of 35 C, being 96 F, is just too hot for tomatoes, plus the sun is too bright. Cacti and melon grow well in a hot greenhouse as they need a temperature of 71.6°F and 75.2°F respectively. I raised one side of the plastic up (rolled it up) about 4 feet and got the temp down to 77 with the fan too, but now the sun is out and on it so it is up to 87 again. Ideal temperature for Chrysanthemum is 60.8°F while Cucumber and Tomatoes thrive in 65°-68°F. But soil temperatures that exceed 95 degrees Fahrenheit by approximately 10 a.m. are too extreme for even the established tomato plant, according … Higher than that causes your tomatoes to go into a perilous stage. 88 now. Well-hydrated plants tend to tolerate cooler or near-freezing temperatures better than dry ones. Yup, it sure is. Tomatoes grow best with warm temperatures, but too much heat can be detrimental to the overall yield of many tomato plants. The illustration below gives a good idea of the key temperature ranges for tomato plants. If your nights are dropping into the 50s or days are in the 100s, then youâ ll have issues with flowers being able to self pollinate. Water and Mulch. It is essential that we know the best tomato plant temperature when planting. Check the greenhouse temperature in the morning; open the doors and vents before leaving for work if warm or hot weather is forecast. You can use many different materials to shade them. The suggested temperature for growing your tomato plants are from 18 degrees centigrade to 26 degrees centigrade. But even more worrisome is the toll the heat takes on the plants. Consistently above 90° F or night time temperatures consistently above 90° F night. 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