aThe USDA plant hardiness map divides North America into 11 hardiness zones. Zone 1 is the coldest; zone 11 is the warmest, a tropical area found only in Hawaii, coastal Southern California and southernmost Florida. In between, the zones follow a fairly predictable pattern across the continent,...
Thanks are due to Dr Marta Ducci for producing the map of Douglas fir provenances in the USA. Funding Project funding: Our research was funded by the Italian Ministry for Agriculture, Food and Forestry Policies in the framework of the “FAO-RGV (FAO-Vegetal Genetic Resources) Project”. Auth...
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