Are Dahlias Perennials In Zone 9. Dahlias grow and flower best in a well-drained sunny site. 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.
The wikipedia article on dahlia says that they are perennial plants. But if you find dahlias that havent been altered genetically too much they should do well in your climate. But some dahlias can handle warm nights better than most.
Besides where do Dahlias grow best.
They are only winter hardy in planting zones 8 to 11. Thats why we recommend most of our dahlias for zones 4-7b only except on the West Coast where summer temperatures are cooler than in the corresponding zones elsewhere in the country and there we recommend them through zone 9bWC only. They wilt in hot sun and often stop blooming when the mercury tops 90 degrees. Sep 29 2020 They are considered a tender perennial in cold regions of North America.