An international perspective on hardiness ratings

Rice, Graham
June 2010
Plantsman: New Series;Jun2010, Vol. 9 Issue 2, p118
Academic Journal
The article focuses on the international systems of rating the hardiness of plants. It states that Great Britain perform the four zone system H1 to H4 based on the growing conditions required by the plants. It cites that Canada based its system on the range of factors which include the minimum winter temperatures, frost-free period length, and summer rainfall. It adds that U.S. rates the plants in four systems but the 11 winter hardiness zones base on winter temperature is the most dominant.


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