Proudly Serving The North Shore Since 1954
USDA Hardiness Zones
The United States Department of Agriculture came up with these zones to decipher which plants are perennial or annual for specific locations. An annual can be grown temporarely almost anywhere. Although if you are looking for something more permanent then you would want to plant a 'hardy' plant, or perennial, which can tolerate the temperature or rain all year in that area. Typically, if you are looking for a perennial, you want it to be the zone you are in or lower. Some locations can be protected and sunnier, where you might even be able to go one zone higher. In Illinois and particularly the Chicago land area, we are zone 5. Some people that live near the lake can be broken down to 5a and 5b. These represent the temperature change due to lake effect. This would mean that typically zone 5b has a low of -10 to -15 degrees, where as 5a can get down to -15 to -20 degrees.
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Ferraro Garden Spot 826 Skokie Blvd., Northbrook, IL 60062 (847) 272-1840
Complete Garden Center & Nursery - Landscape Contractors - Specializing in Container Design