The Hardiest of Hardy Perennials. Generally speaking, a plant is classified as a perennial if it can survive to Zone 7. Above that range, plants become tender perennials or annuals. For the purpose of this article, we will only consider the "hardiest" of hardy perennials, plants that are hardy to Zones 4 and lower (or higher in latitude). The plants on this list are definitely tough enough to survive your area's worst winters.
Lavender Hidcote is one of our very best-selling sun perennials! It makes the perfect low-growing hedge ! This drought-tolerant & hardy perennial has extremely fragrant foliage & flowers that are enjoyable in the garden, or cut-fresh & added to flowe