Plant Zones

A zone rating is an attempt to match a plant's survival with a set of environmental conditions. These conditions include minimum winter temperature, frost free period, snow cover and wind speed.

Zone ratings are only a guide for plant selection. Plant survival is also impacted by bodies of water, wind protection, snow cover and urban heat islands. For this reason there will be always be trees and shrubs that defy the odds and thrive under conditions very different from their zone rating.