Regions

USDA Hardiness Zones
5 to 8

AHS Heat Zones
4 to 10

The Region
From the eastern slopes of the Cascade and Sierra ranges through the High Plains, this generally arid region battles bitterly cold winters, blustery spring winds, little rain and sometimes brutal summer heat. The soil presents challenges, too, be it alkaline, sandy, clay or infused with salt and boron. Fortunately, the severe climate poses few insect or disease problems. But the roses that thrive here must be cold hardy and survive wild swings in temperature. They often bear strong, leathery leaves to resist desiccation. They also appreciate regular irrigation, heavily amended soil, a thick layer of mulch and protection from the wind.