This vigorous, clump-forming perennial brings late-summer elegance to mixed borders with its airy sprays of semi-double to double white flowers. 'Whirlwind' features captivating 6cm (2in) wide blooms composed of narrow, slightly rolled petals, some with a distinctive green flush or quilled appearance. The flowerheads are enhanced by a central boss of yellow stamens, creating a delicate contrast against the plant's handsomely lobed foliage. Ideal for the middle of a border, this Japanese anemone hybrid adds height and and texture, its robust nature ensuring a stunning display that extends the garden's visual interest well into the autumn months.