Vinca minor (Lesser Periwinkle) is a vigorous, evergreen mat-forming perennial with glossy dark green leaves and large lavender blue flowers from mid-spring to early summer. Borne over a long period, they continue to flower intermittently throughout summer into fall and are valuable for enlivening dark areas. The long, trailing stems root at the nodes as they go along the ground to form a dense carpet of rich foliage. Excellent for suppressing weeds, this vigorous periwinkle is one of the most popular and widely used groundcovers.