Featuring deep black-purple flowers on towering spikes in midsummer; tolerant to the natural toxin formed by the roots of Black Walnut; selections from this series are truly perennial; plant in full sun for better growth. Blacknight Hollyhock features bold spikes of black round flowers with white eyes and deep purple streaks rising above the foliage from mid to late summer. The flowers are excellent for cutting. Its large tomentose round leaves remain grayish green in color throughout the season. The fruit is not ornamentally significant.