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In addition to cold tolerance, plant hardiness has been observed to be linked to how much stress specific plants are undergoing into the winter, or even how fast the onset of cold weather is in a specific year. This means that often stressed plants will exhibit less cold tolerance than plants that have been well maintained.
These run from H7, the hardiest (tolerant of temperatures below −20 °C (−4 °F)) to H1a (needing temperatures above 15 °C (59 °F)). [62] The RHS hardiness ratings are based on absolute minimum winter temperatures (in °C) rather than the long-term average annual extreme minimum temperatures that define USDA zones. [62]
The highest temperature ever measured in Texas was 120 °F (48.9 °C), recorded on August 12, 1936 in Seymour, during the 1936 North American Heatwave, and again on June 28, 1994 in Monahans. The lowest temperature ever measured in Texas was −23 °F (−30.6 °C), recorded on February 8, 1933 in Seminole. [29]
We seem to take pride in how quickly our weather can change, yet it’s our plants that are left out to suffer. Just look at what’s happened in the cold spells of February 2021 and December 2022.
Syringa × persica, the Persian lilac, is a hybrid, thought to originate from a cross of Syringa × laciniata and S. afghanica. More compact than common lilacs, it grows up to 4–8 feet (1.2–2.4 m) and spreads about 5–10 ft (1.5–3.0 m). Persian lilac prefers warmer winter climates (hardiness zones 5–9) than many species of lilac.
When you get a break in the cold weather in the next several weeks apply a broadleafed herbicide containing 2,4-D to kill developing weeds such as dandelions, clover, henbit, chickweed, plantain ...
The Farmers' Almanac recently unveiled its forecast for the 2024-25 winter in Texas. For the most part, the season should be mild. Will Texas freeze again in 2024?
Thermotolerance is the ability of an organism to survive high temperatures. An organism's natural tolerance of heat is their basal thermotolerance . [ 1 ] Meanwhile, acquired thermotolerance is defined as an enhanced level of thermotolerance after exposure to a heat stress.