Answer: Green Tower is considered hardy to USDA winter hardiness zone 5; some boxwoods are considered hardy into zone 4 such as Green Mountain, Green Velvet, and Chicagoland Green for example. It does best in a well drained soil with protection from winter winds, so microclimate is also important. Your local retailers should be able to help you select a boxwood that would grow well for you in the site you want to plant, or if not, should be able to suggest a substitute. And, if hardiness is an issue they may not carry it in your area for just that reason. Good luck with your boxwoods!
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