How to grow viola plants. Viola plants are often available from garden centers or online nurseries. 'Violas can be planted in early spring for a cool-weather display, or in late summer to early ...

V. cornuta varieties, frequently hybridized, are compact, 6-10 inches tall, with 1 to 2-inch flowers in two-to-three colors. They may have unusual patterns and/or rays in deeper, contrasting colors.