The Perennial Plant Association has selected Geranium xcantabrigiense 'Biokovo' as this year's winning perennial.
Biokovo has delicately scented light pink flowers in spring, followed by gorgeous scarlet and orange fall color.
It's a naturally occurring hybrid of Geranium dalmaticum and Geranium macrorrhizum that was found by Dr. Hans Simon of Germany in the Biokovo mountains of Croatia.
At six to 10 inches high, it makes a terrific groundcover, as it's semi-evergreen in most climates. Biokovo does well in average well-drained soil in full sun to part shade, and it spreads by rhizomes. However, the plant is not deeply rooted, so it can be easily pulled out if it strays too far. Zones 4-8.