A Japanese variety, Helianthus annuus 'Taiyo' (Common Sunflower) is a fast-growing, well-branched annual with large, dark green, pointed leaves and dazzling flowers. In summer, it produces large, single blossoms, up to 10 in. across (25 cm), with brilliant yellow petals surrounding a huge dark chocolate central disk. The flower heads are attractive to bees, butterflies and birds. Easy to grow and sensational at the back of a sunny border, this exquisite Sunflower makes magnificent cut…