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Tender plants are those killed by freezing temperatures, while hardy plants survive freezing—at least down to certain temperatures, depending on the plant. "Half-hardy" is a term used sometimes in horticulture to describe bedding plants which are sown in heat in winter or early spring, and planted outside after all danger of frost has passed.
If the snow cover is reliable, the actual temperature to which the roots are exposed will not be as low as the hardiness zone number would indicate. As an example, Quebec City in Canada is located in zone 4, but can rely on a significant snow cover every year, making it possible to cultivate plants normally rated for zones 5 or 6.
Temperatures measured directly on the ground may exceed air temperatures by 30 to 50 °C (54 to 90 °F). [6] The highest natural ground surface temperature ever recorded may have been an alleged reading of 93.9 °C (201.0 °F) at Furnace Creek, California , United States, on 15 July 1972. [ 7 ]
Plants low to the ground can create their own microclimate: when the air temperature away from the ground is −12 °C (10 °F), the temperature of dark moss can be 10 °C (50 °F). [12] Even if the local microclimate cannot maintain temperatures above 0 °C (32 °F), some arctic plants and flowers, such as Chamaenerion latifolium , can survive ...
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Aerial photograph of Vostok Station, the coldest directly observed location on Earth. The location of Vostok Station in Antarctica. The lowest natural temperature ever directly recorded at ground level on Earth is −89.2 °C (−128.6 °F; 184.0 K) at the then-Soviet Vostok Station in Antarctica on 21 July 1983 by ground measurements.
If you need thawed tomatoes even quicker, place the tomatoes in a zip-top bag (if they aren't already in one!) and run warm water over the bag until the tomatoes are thawed.
Many bacteria can survive adverse conditions such as temperature, desiccation, and antibiotics by forming endospores, cysts, or general states of reduced metabolic activity lacking specialized cellular structures. [15] Up to 80% of the bacteria in samples from the wild appear to be metabolically inactive [16] —many of which can be ...
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