perennial cornflower 'Gold Bullion'

A clump-forming perennial to around 50cm high in flower, with a spreading habit and downy, bright yellow-green leaves. Flowers from late spring through the summer, with slender stems bearing buds encased in overlapping bracts, which open to large, showy flowers, with a ring of fine blue outer florets surrounding a crowd of tiny, deep reddish-purple flowers in the centre