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For practical purposes, Canada has adopted the American hardiness zone classification system. The 1990 version of the USDA Plant Hardiness Zone Map included Canada and Mexico, but they were removed with the 2012 update to focus on the United States and Puerto Rico. [8] The Canadian government publishes both Canadian and USDA-style zone maps. [37]
Thus a plant's ability to tolerate cold, heat, drought, flooding, or wind are typically considered measurements of hardiness. 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.
It requires neutral or slightly alkaline soil in a sheltered, frost-free spot, or it can be grown in an unheated greenhouse or conservatory, in the UK. [9] [10] It is hardy down to USDA Zone 6. [8] In the UK, it has been given a hardiness rating by the RHS of H4: −15 °C (5 °F) (hardy in most locations). [11]
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.
According to the new map released in November 2023, about half of the United States has shifted to a new hardiness zone. That's really big news if you consider 80 million Americans use this map to ...
In cultivation this plant has gained the Royal Horticultural Society's Award of Garden Merit. [ 9 ] [ 10 ] It has an RHS hardiness rating of H4 (hardy throughout most of the UK, down to -5°/-10 °C) [ 9 ] and is suited to USDA hardiness zones 8 to 9.
Widely used as a garden plant in warm temperate and subtropical gardens, [23] Gardenia jasminoides is hardy in USDA hardiness zones 8 to 10, [4] or zone H1C in the UK (outdoor temperatures above 5 °C (41 °F)). [21]
In cultivation in the UK, this plant has received the Royal Horticultural Society's Award of Garden Merit. [8] An adaptable plant, it prefers a sunny, open position. It is hardy down to -10 to -15 degrees C. [7] It is also drought tolerant and grows well in USDA hardiness zones 3–8. [9] Common problems include aphids and downy mildew. [10]