1-gallon pot. Coreopsis plants commonly known as Tickseed attract butterflies and are deer resistant. Coreopsis are renowned for their cheerful yellow flowers. From late spring to late summer you can count on the welcoming yellow blooms of Tickseed. Coreopsis are easily grown and make good-cut flowers. These perennial plants prefer well-drained soil in full sun. Remember to keep the plants deadheaded for the best flowering. Make sure to leave a few seed heads at the end of the season so the plant will reseed itself.