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English: Michigan USDA Plant Hardiness Zone Map. Date: 15 May 2008: Source: This image: self-made by Phizzy Base Map:Can YOU help provide this information?
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.
USDA plant hardiness maps, updated for the first time in a decade, show a 2.5-degree Fahrenheit increase in temperatures across the contiguous U.S.
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]
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It is a small shrub growing to 10–20 cm (4–8 in) (rarely to 40 cm or 16 in) tall with slender stems. The leaves are evergreen, alternately arranged, lanceolate, 1–5 cm (1 ⁄ 2 –2 in) long and 2–8 mm (0.08–0.31 in) broad, dark green above (purplish in winter) and white beneath with the leaf margins curled under.
It also tends to be lower-growing, often under 25 cm (9.8 in) tall and prostrate, and never exceeding 1 m (3 ft 3 in) tall (S. rosmarinus can reach 1.5 m (4 ft 11 in), exceptionally 2 m (6 ft 7 in), tall). Rosemary can be propagated from seed or cuttings in summer, [5] and can be spread by carelessly discarding garden waste. [6]