Viola tricolor

 (Viola tricolor)has tufts of heart-shaped leaves and plenty of 1-inch yellow and purple flowers with brown "whiskers" and purple "chin" over a long period. It self-seeds freely. It grows to 5 inches tall and is hardy, but is often treated as an annual.
Light: Sun,Part Sun,Shade
Plant Type: Perennial
Plant Height: 1-12 inches tall, depending on variety
Plant Width: 6 inches or indefinitely wide, depending on variety
Bloom Time: Blooms spring, fall, and winter in mild climates, depending on variety
Landscape Uses: Containers,Beds & Borders,Groundcover
Special Features: Flowers,Attractive Foliage,Fragrant,Winter Interest,Cut Flowers,Tolerates Wet Soil,Easy to Grow.