Threadleaf coreopsis are favorites of every gardener. 'Moonbean', with its buttery yellow petals, blends with just about everything. 'Limerock Ruby' prefers to take center stage. This red is on the rusty side, so purple and pink flowers will clash and pale blues will disappear. But don't let that scare you away. 'Limerock Ruby' will bloom long and late into the season and looks really great with Rudbeckia, Goldenrod and other fall bloomers in saturated jewel tones.