Coreopsis palustris ‘Summer Sunshine’ is a cultivar of the American native commonly referred to as Swamp Tickseed. Summer Sunshine is highly rated in field trials for its performance. The bright yellow flowers stand atop lush foliage to about 2-3′ feet in height. The bloom period may last up to six weeks starting in early fall. Summer Sunshine, like other members of the genus, prefers full sun with ample moisture in well drained soil. Coreopsis ‘Summer Sunshine’ is an excellent butterfly plant.