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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.

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.

Want more butterflies in your yard? Plant the nectar plants they love! Here's a great list of butterfly-attracting annual and perennial plants.

Want more butterflies in your yard? Plant the nectar plants they love! Here's a great list of butterfly-attracting annual and perennial plants.

Make your flower border more interesting by pairing perennials with different flower shapes. Here, for example, the skinny, bright blue flower spikes of veronica contrast nicely with the fat, rounded blooms of coneflower. Planted individually they are lovely, but grown together they put on an eye-popping show.

Make your flower border more interesting by pairing perennials with different flower shapes. Here, for example, the skinny, bright blue flower spikes of veronica contrast nicely with the fat, rounded blooms of coneflower. Planted individually they are lovely, but grown together they put on an eye-popping show.

solomon's seal   Remember to use this and also to transplant some under the big maple with the hostas

solomon's seal Remember to use this and also to transplant some under the big maple with the hostas

Fragrant Perennial Plants  Phlox 'Creeping' - Thrift A carpet forming Phlox that is covered with sky-blue flowers in Spring. Excellent for use as a border in the landscape or perennial garden, or on slopes. Very drought tolerant.

Fragrant Perennial Plants Phlox 'Creeping' - Thrift A carpet forming Phlox that is covered with sky-blue flowers in Spring. Excellent for use as a border in the landscape or perennial garden, or on slopes. Very drought tolerant.

Buy Heuchera Raspberry Ice Perennial Plants Online. Garden Crossings Online Garden Center offers a large selection of Coral Bells Plants. Shop our Online Perennial catalog today!

Buy Heuchera Raspberry Ice Perennial Plants Online. Garden Crossings Online Garden Center offers a large selection of Coral Bells Plants. Shop our Online Perennial catalog today!

As the garden hits a summer lull, Toby Buckland picks 10 plants that will hold interest, come rain or shine.

As the garden hits a summer lull, Toby Buckland picks 10 plants that will hold interest, come rain or shine.