Hollyhocks are one of the defining plants of the cottage and cutting garden — towering spikes of large, crepe-paper flowers in shades from white and cream through pink, apricot, red, and near-black, with the distinctive hollyhock silhouette recognisable from a distance. Biennial or short-lived perennial, they bloom most prolifically in their second year and self-seed freely if allowed.
As cut flowers, individual hollyhock blooms are short-lived but the whole spike lasts several days as successive buds open. Cut when the lower third of the spike is in bloom. The stems are hollow — flip upside-down and fill with water before sealing with your thumb to extend vase life.
Powdery mildew
White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.
Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.