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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. [20]
It is fast growing: [5] germination under favourable conditions takes approximately 10 days, with plants reaching maturity in approximately 60–75 days. [6] [8] It is a perennial species, but as it is not frost hardy it is often grown as an annual. [5] Its leaves have three or five lobes, and are 3–7 cm (1.2–2.8 in) in length and width. [9]
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USDA plant hardiness zone regional map - North Central US. The climate is humid continental, displaying both the cool summer and warm summer subtypes as one travels from north to south. [24] The United States Department of Agriculture has the region falling mainly in zone 5a, with the northern fringe being 4b. A few patches in Wisconsin are 4a.
2.9 Australia, Melanesia, New Zealand, Lesser Sunda Islands, Sulawesi, Maluku Islands and the neighbouring islands. The northern boundary of this zone is known as the Wallace Line. Indomalaya: 7.5 2.9 The Indian subcontinent, Southeast Asia, southern China and most of the Greater Sunda Islands. Oceania: 1.0 0.39
In the United States, the EPA and the United States Geological Survey (USGS) are the principal federal agencies working with the CEC to define and map ecoregions. Ecoregions may be identified by similarities in geology , physiography , vegetation , climate , soils , land use , wildlife distributions, and hydrology .
This plant does best in moist soils, and is found naturally in areas such as swamps, wet savannas, pine flatwoods, bogs, and fens. [5] It prefers full sun, and is best suited to USDA hardiness zones 5–9. [4]
The life zone concept was developed by C. Hart Merriam in 1889 as a means of describing areas with similar plant and animal communities. Merriam observed that the changes in these communities with an increase in latitude at a constant elevation are similar to the changes seen with an increase in elevation at a constant latitude.