A hard frost doesn't mean all plants … Temperatures of 40 F might not kill healthy marigolds, but when the air and ground around the plants … When folks worry about the effects of cold weather on corn, they often fail to distinguish between simple frost events and lethal cold temperatures. And, while some damage is common, it is important to determine the extent of such injury. Last night was supposed to dip to 40’degrees so I put an electric heater in there and about 1/3 of my trays are on the heat mat. Hardy and Semi-Hardy Crops. Hardy plants: Hardy plants are ones that can tolerate temperatures as low as 45 degrees. Windowsills: While window areas make a great place for plants to sit within summer because of the light and warmth supply - during the winter drafts can cause certain plants problems. I live in Texas and we are having a sudden cold front tonight with a low of 38. This is very difficult to do and be accurate since cold tolerance depends on preconditioning. You may want to bring your plant back a few inches or so, or draft proof the window. There are no strict cutoff numbers or formal definitions for slightly acidic versus acidic, but as a rule of thumb, consider pH numbers between 6.0 and 7.0 as slightly acidic and those below 6.0 as acidic.. Alas, it is not! If these same broccoli plants had experienced cool weather, they would probably survive the sudden cold. In an unheated greenhouse, growing anything during the cold months of winter may seem impossible. Beets * Beets need soil temperatures of at least 40 degrees but prefer 50 degrees and above. On the other end of the scale, a temperature below 42 degrees Fahrenheit (6 C) will cause leaf chlorophyll destruction. Water the plants regularly for cold protection. You will need to bring your plants indoors before nighttime temperatures dip below 45 degrees (F). Even a small breeze can help stop cold air from settling on your plants and then freezing during the night. Move smaller pots indoors or under a cover. The root systems of cool-season plants are shallower and the plants themselves are smaller than warm-season vegetable plants. Plants that are well hydrated will always tolerate cold or even freezing temperatures much better than non-hydrated ones. Both prefer medium light and warm conditions - tolerates 62 degrees F, but prefers 70-75 degrees and also avoid excessively hot or cold areas. I understand frost and freeze, although we have barely seen either since Jan or Feb of 2010. They typically stop producing in early summer when temperatures reach 80°F. Specifically, growth stops and heat stress will occur at 100 degrees Fahrenheit (38 C). In regions where nights remain cool, you can sow cool-season vegetables every two weeks for a continual harvest that extends into fall. Light freeze (29 to 32 degrees F) kills only tender plants, moderate freeze (25 to 28 degrees) will be widely destructive to plants and fruits, and severe freeze (24 degrees and colder) damages most plants. FROST: Damage depends upon the length of frost duration. Hardly Hardy. Learn your which growing zone you are in (if your country has such a classification system; the US system is coordinated by the USDA) or at least your likely low and high temperatures for the year and choose plants that can withstand those temperatures. Tomatoes in a pot vs tomatoes in soil Getting plants out into the main vegetable bed is essential for good growth! If it gets too cold even with the covers on, consider adding some lights under the covers. * Soak beet seeds in warm water for about 24 hours before sowing to aid germination. Normal Effect of Cold Weather on Plants. Lately, nightly lows have been somewhere between 40 and 60 degrees. 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