An annual or biennial. Glossy leaves form in tufts. Flowers appear from late summer to fall. Suitable for wild gardens and borders.

A semi-evergreen perennial suitable for rock gardens. Leaves form in rosettes. The solitary flowers lack stalks. Blooms in fall.

A climbing perennial. Leaves are pointed and toothed. The blue, purple or white flowers appear in late summer. Dies back in winter.

An upright perennial with glossy leaves. Clusters of flowers appear on erect stems in late summer, early autumn. Dies back in winter.

A semi-evergreen perennial suitable for rock gardens. Leaves form in rosettes. The solitary flowers lack stalks. Blooms in fall.

A semi-evergreen perennial, suitable for rock gardens. Leaves form on rosettes. Solitary flowers appear on long stalks in summer.

An upright, clump-forming perennial, suitable for bog gardens. Flowers appear in clusters, in late summer. Dies back in winter.

A spreading perennial, with prostrate, branched stems. Clusters of flowers appear in late summer. Dies back in winter.

An evergreen perennial suitable for rock gardens. Solitary flowers appear in late spring and early summer.

An upright perennial that dies back in winter. Flowers appear in late summer.