A striking rhizomatous perennial which typically grows in dense, bushy clumps, producing masses of single yellow, daisy-like flowers throughout the summer. Known commonly as whorled coreopsis, this plant holds the coveted RHS Award of Garden Merit & makes an excellent border filler with its well-branched habit & airy clumps of feathery leaves. Coreopsis verticillata ' Zagreb' is useful not only in herbaceous borders, but grows well in patio containers, where it attracts swarms of bees & butterflies to its nectar-rich blooms. Height & spread: 30cm (12).