Freeze-Proof Plants

This rugged Tennessee wildflower can grow just about anywhere, and most varieties are hardy to Zone 3. Cut down the stems, then add 3-4 inches of mulch to insulate the plants through the winter to help them bounce back beautifully next summer.

Don't let its dainty blooms fool you — lily-of-the-valley (Convallaria majalis) is a tough plant. Hardy in Zones 2 to 7, the plant can thrive in practically any soil or climate and is a long-time favorite for shade gardens. Be aware though, this freeze-proof plant can become borderline invasive without proper care and attention.

Hardy to Zone 3, Siberian iris shakes off cold cold winters. The low-maintenance, animal pest-resistant plants tolerate wet and dry soil, making them a perfect choice for a rain garden. Flowers appear in late spring and linger into early summer.

American mountain ash (Sorbus americana) loves cool weather and moist, well-draining soil that mimics its native mountain climate. It's hardy in Zones 3 - 6.