Keep soil properly limed and fertilized. All have creeping stems, opposite leaves, and small blue or white, four-petalled flowers. The familiar common violet, with its blue or purple flowers and heart-shaped leaves. Sometimes invades lawns. Hard to kill.
Blossoms attract bees and other stinging insects.
Keep turf properly fertilized. Grows vigorously in spring and fall, but foliage disappears in summer. Produces many whitish seed heads. Forms patches which may suddenly die out in hot dry weather. For possible pre-emergence control, apply Dacthal in late summer or early fall.