This requires large volumes of water and continuous applications throughout the cold event. Growers who have solid set irrigation in place and have experience with frost protection using overhead water applications, may be planning to use this method. Protecting from these cold temperatures can be a little more difficult to answer. Cold season crops like Brussels sprouts, beets, collards, kale, parsley, and spinach should survive. In the event that the temperature drops below 26 ✯ during a hard freeze for a longer period of time, there are some vegetables that will survive these temperatures. They will likely show foliage damage due to the cold and this may result in a yield reduction later in the season, but the plant will survive. These include broccoli, cabbage, cauliflower, chard, English peas, lettuce, mustard, onion, radishes, and turnips. There are cool-season crops that will tolerate a temperature dip to these temperatures for a limited period of time. When temperatures dip below 26-31 ✯, this is a hard frost or freeze. We usually think of frost as occurring at temperatures from 31-33 ✯ and this will result in damage or killing the foliage of warm-season plants like beans, corn, cantaloupe, cucumbers, eggplant, okra, southern peas, peppers, potatoes, sweet corn, sweetpotatoes, squash, tomatoes, and watermelon. It is important to remember that cold damage results from the actual temperature and the duration of that temperature. The following vegetable crops can be grouped according to their cold tolerance based on their physiology. If water within the plant cell or between the plant cells freeze, this can result in damage to plant tissue. A frost occurs when temperatures dip to 32 ✯ and water starts to freeze on low lying surfaces. Not only are daily low-temperature records threatened, but the latest spring freeze on record is May 10 for Raleigh (31 ✯) and May 8 for Greensboro (32 ✯).Īs cold temperatures are threatening, agents and specialists are getting calls from concerned vegetable growers worried about potential damage on their crops.
Record low temperatures for May 10 are in the lower 30s at the Greensboro and Raleigh-Durham locations, and 39 ✯ at Fayetteville. Sunday morning, May 10, low temperatures are predicted to drop into the 30s with some temperatures possibly below freezing in low lying rural areas. Weather predictions for this weekend include clear skies with minimal or calm winds, which are conducive to cold temperatures and could lead to freeze or frost conditions in North Carolina. Horticultural Science, NC State University Jonathan Schultheis, Extension Vegetable Production Specialist Estoy de Acuerdo / I agreeįrost and Freeze Protection for VegetablesĬhris Gunter, Extension Vegetable Production Specialist Please note that some applications and/or services may not function as expected when translated. NC State Extension does not guarantee the accuracy of the translated text. As with any Internet translation, the conversion is not context-sensitive and may not translate the text to its original meaning.
Cold tolerance of sweet broom free#
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