Guides by Region: Northern California Guides
The USDA Hardiness Zone Map divides North America into 13 zones of 10°F each, ranging from -60°F (-51°C) to 70°F (21°C). If you are planning to buy a shrub, perennial or tree, you need to make sure that this new plant will tolerate year-round conditions in your area.
The following is a list of Azaleas and Rhododendrons recognized as proven performers in Northern California. Most of them have received the Rhododendron of the Year Award of the American Rhododendron Society.
All-America Rose Selections (AARS) is a non profit association founded in 1938 for the purpose of evaluating rose varieties and promoting exceptional roses. For more than 60 years, AARS has been testing roses on the basis of color, form, fragrance, floral impact, habit, vigor, foliage, disease resistance, repeat bloom, aging quality and novelty.
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