Lettuce seedlings will generally tolerate a light frost and, unlike most vegetables, continue to grow through the fall when the possibility is a probability in some regions. Generally, when it comes to lettuce, gardeners are more concerned with heat tolerance than with cold tolerance, but if you want to get an early start on your spring garden or you are hoping for a winter harvest, lettuce temperature tolerance becomes important. Lettuce Growing Guide. Frosty conditions in your refrigerator will definitely damage the tender lettuce greens, leaving you with a slimy mess. So if you love your citrus and you live in a cooler climate, take heart. Broccoli is part of the Brassica family of vegetables, which are frost tolerant and cold hardy.. Michigan State University provides home gardeners and commercial farmers a comprehensive discussion on options for extending the growing season. Asteraceae Lactuca sativa SuperFifty® Prime is a ground-breaking product developed under the AgriPrime® technology platform. Calcium is also of great importance as it is adsorbed in great quantity but with many difficulties. Frost tolerant and cold hardy are not really the same thing, although they are often used interchangeably. Looseleaf lettuce produces an abundance of single leaves perfect for using in salad. Frost damage on leafy vegetables doesn't render the plant inedible like a disease. Any damage to lettuce due to frost should be removed or the plants will begin to decay and become inedible. Colder temperatures (26-31 degrees F.) may burn foliage but will not kill broccoli, cabbage, cauliflower, chard, lettuce, mustard, onion, radish, and turnip. Although tender in your salads, spinach is actually a tough little plant. Shelley has been writing and editing garden stories for 10 years, and has a Master Gardeners certificate in Oregon. So I cover mine till I know more about it. Since iceberg lettuce are one of those plants that can tolerate a tiny bit of cold weather you can plant them just a tiny bit earlier in the year than other frost tender plants. If you want to grow parsnips for winter harvests, you’ll need to start in spring — parsnips must be planted no later than early May here in zone 6, as they can take up to 130 days to mature. The University of California Salinas Valley Agriculture reports that severe frosts may cause necrotic lesions and spotting on the leaves, which resemble heat damage or pesticide burn. Original Author. That said, cold, clear nights may create frost damage in lettuce, especially if the duration of the cold snap is lengthy. Another green variety, ‘Igloo,’ with its lightly serrated leaves, is quick to mature in only 70 days. Romaine Lettuce Care: Learn About Planting Romaine Lettuce, Growing Lettuce In The Garden – How To Grow Lettuce Plants, Different Lettuce Types: Varieties Of Lettuce For The Garden, What Is A Houseplant Box – Keeping Plant Boxes Indoors, Handmade Wrapping Paper – Making Wrapping Paper With Plants, Treating Cyclamen Mites: How To Control Cyclamen Mites, Aquaponics How To – Information On Backyard Aquaponic Gardens, What Is Molybdenum: Information On Molybdenum Sources For Plants, Witchgrass Weed Control – How To Get Rid Of Witchgrass. Broccoli. This is one of the most fast-growing, cold-hardy or frost tolerant vegetable plants that can withstand up to 5 degrees Fahrenheit (-15 degrees Celsius). In general, a frost (31-33 degrees F.) will kill beans, cantaloupe, corn, cucumbers, eggplant, okra, peas, pepper, potatoes, sweet potatoes, squash, tomatoes, and watermelon. For beets, spring market carrots and parsnips, the tops will die but the roots will tolerate lower temperatures. 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