Are Dahlias Hardy In Zone 7. I am not aware of any dahlia studies that evaluated borderline hardiness. Be thankful that you dont have to dig and store 2 acres of those beauties.
Jun 12 2020 SUN AND SHADE Dahlias are sun-lovers and need a minimum of 6 hours of sunlight per day. The more sun they get the better theyll bloom so its best to plant your dahlias in the sunniest location you can. Gardeners in zones 2 to 7 can simply plant dahlia tubers in the spring and either treat them as annuals or dig them up and store for winter.
In zone 7 they can survive winters with a.
ZONE Though dahlias are only winter hardy in zones 8-11 gardeners in zones 3-7 can grow dahlia as annuals. To avoid any risk bring the tubers indoors following the instructions for colder zones. Cut the foliage in the fall after the first killing frost in USDA Hardiness Zones 4 to 7. Wait until a hard frost has turned the plants black to put the dahlias to bed.