Tickseed coreopsis. A native perennial wildflower, tickseed coreopsis thrives where soils are dry to average. This coreopsis typically blooms in late spring to early summer, but deadheading will prolong flowering. 'Baby Sun' and 'Sunray' are compact varieties that don't sprawl like the species does. 'Sunfire' and 'Sternthaler' bloom until frost. USDA Zones 3-8.