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A plant may be described as "hardy to zone 10": this means that the plant can withstand a minimum temperature of 30 to 40 °F (−1.1 to 4.4 °C). Unless otherwise specified, in American contexts "hardiness zone" or simply "zone" usually refers to the USDA scale.
Hardiness of plants is defined by their native extent's geographic location: longitude, latitude and elevation. These attributes are often simplified to a hardiness zone. In temperate latitudes, the term most often describes resistance to cold, or "cold-hardiness", and is generally measured by the lowest temperature a plant can withstand.
Windmill palms are the most cold and cool summer hardy of all the palms, although absolute minimum temperature may be exceeded by needle palms, Sabal minor, as well as very brief nighttime cold exposure to desert palms. For instance, on the northern coast of Estonia, in hardiness zone 6, individual Trachycarpus fortuneis are also grown. [4] [5]
Passiflora foetida - is native to the desert southwest US and is cold hardy and drought tolerant variety of passionflower grown from zones 8. [1] [2] Passiflora incarnata - Maypop is native to central and eastern United States, and is cold hardy and drought tolerant variety of passionflower grown from zones 5. [8] [9] [10] [11]
Growing degrees (GDs) is defined as the number of temperature degrees above a certain threshold base temperature, which varies among crop species. The base temperature is that temperature below which plant growth is zero. GDs are calculated each day as maximum temperature plus the minimum temperature divided by 2, minus the base temperature.
Cold-hardy citrus is citrus with increased frost tolerance and which may be cultivated far beyond traditional citrus growing regions. Citrus species and citrus hybrids typically described as cold-hardy generally display an ability to withstand wintertime temperatures below −5 to −10 °C (23 to 14 °F).
Late summer into early fall, as the temperature begins to drop, is the best time to plant all types of cool-weather grass seed. The grasses need to have time to establish roots before the first ...
For example, a plant that is described as "hardy to zone 10" means that the plant can withstand a minimum temperature of -1°C. A more resilient plant that is "hardy to zone 9" can tolerate a minimum temperature of -7°C. First developed for the United States by the Department of Agriculture (USDA), the use of the zones has been adopted by ...
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