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The USDA Plant Hardiness Zone Map Just Changed for the First Time in Over 10 Years. AnnMarie Mattila. March 17, 2024 at 9:00 AM. The first day of spring will be here before you know it!
Kalmia latifolia, the mountain laurel, [3] calico-bush, [3] or spoonwood, [3] is a flowering plant and one of the 10 species in the genus of Kalmia belonging to the heath(er) family Ericaceae. It is native to the eastern United States. Its range stretches from southern Maine to northern Florida, and west to Indiana and Louisiana.
Dermatophyllum secundiflorum is a species of flowering shrub or small tree in the family Fabaceae [2] that is native to the Southwestern United States (Texas, New Mexico) and Mexico (Chihuahua and Coahuila south to Hidalgo, Puebla, and Querétaro). [3] Its common names include Texas mountain laurel, Texas mescalbean, frijolito, and frijolillo. [2]
For example, Seattle, Washington, and the city of Austin, Texas, are both in the USDA hardiness zone 9a because the map is a measure of the coldest temperature a plant can handle.
Dermatophyllum/Sophora secundiflora is a genus of three or four species of shrubs and small trees in the family Fabaceae.The genus is native to southwestern North America from western Texas to New Mexico and Arizona in the United States, and south through Chihuahua, Coahuila, and Nuevo León in northern Mexico.
What does the cold hardiness map measure? The polar vortex hit Louisville Wednesday, Jan. 30, 2019. Wind chills reached between -15° and -20° by noon.
During the winter months, the plant hardiness zone is 6a with an average annual extreme minimum air temperature of −9.0 °F (−23 °C). [3] Since 1981, the coldest air temperature was −18.5 °F (−28 °C) on 01/21/1994. Episodes of extreme cold and wind can occur with wind chill values < −21 °F (−29 °C).
The hardiness zone maps As long as there have been gardeners, people have noticed that some plants can survive extremely cold temperatures while others cannot. Tomatoes die at 32.