How to Overwinter Rosemary in Pots and in the Ground in Colder Zones

Rosemary, an evergreen drought-tolerant herb, can thrive in zones 8 through 10, though varieties known as Arp and Hills Hardy (also called Madalene Hill) are known for being extra hardy even down in zones 6. Central Illinois gardeners sometimes attempt to overwinter rosemary outdoors by placing it against walls for protection before applying a thick layer of mulch after frost has hit.

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