Caring for Hollyhock

Water hollyhocks regularly during dry spells in spring and summer, especially while flower spikes are developing. Aim for deep watering once or twice a week rather than frequent shallow sprinkles, as this encourages strong root growth. Once established, they tolerate moderate drought but flower better with consistent moisture. Reduce watering in autumn and winter when plants are dormant. Feed in April and May to support vigorous growth and abundant flowering. Apply a general-purpose granular fertiliser such as blood, fish and bone around the base of each plant, or use a balanced liquid feed every fortnight during the growing season. Avoid high-nitrogen feeds, which promote leafy growth at the expense of flowers. Hollyhocks are fully hardy across temperate Europe and need no special winter protection. The basal rosette of leaves will persist through winter and resprout in spring. A light mulch of compost or well-rotted manure applied in late autumn helps insulate roots and adds organic matter. Rust is the most common problem—orange-brown pustules appear on leaves, often starting at the base and spreading upwards. Remove affected leaves promptly and ensure good spacing and air circulation to minimise spread. Avoid overhead watering, which encourages fungal diseases. In severe cases, apply a fungicide labelled for rust, though prevention through good hygiene is more effective. Aphids occasionally cluster on young shoots and flower buds; squash by hand or spray with soapy water. Slugs and snails may damage emerging shoots in spring, so use organic pellets or barriers if necessary. Mulch annually to suppress weeds and retain moisture.