Zagreb threadleaf coreopsis forms a fine-textured, mounding clump of needle-like foliage that erupts into a long-lasting, prolific display of bright yellow, daisy-like flowers from early summer through fall. Its airy texture and compact size make it an excellent filler in borders, containers, and mass plantings, and deadheading extends the already generous bloom period even further. Established plants are tough and reliable performers with minimal input.