Garden Scheme
Plant library · Perennial Flowers
Alcea rosea
Hollyhock brings a strong upright accent to a sunny planting, rising about 6 feet while holding a footprint roughly 2 feet wide. Its tall flower stems make the most sense at the back of a border, where they can form a vertical backdrop without screening lower plants. Use it where early- to midsummer bloom can be seen above surrounding foliage and where the planting can retain good air circulation.
Space Hollyhock 18 inches apart, measured center to center (45 cm).
The mature spread is about 2 ft (60 cm), so plants set at that distance grow together into a solid mass.
Treat 18 inches as a planning baseline — cultivar and local growing conditions shift the final footprint.
Place hollyhocks along a fence, wall, or rear border rather than in the middle of a bed. A repeated row can give a long boundary planting height and rhythm; keep the front edge available for shorter plants and for reaching into the bed. In exposed ground, site the row where a fence or wall helps reduce wind, or allow space for discreet support if stems need it. Avoid placing it beside narrow paths where mature stems would lean into circulation.[1][2]
Set plants 18 inches apart, measured center to center, to build a close flowering line. Individual plants can spread to about 2 feet wide, so expect neighboring foliage to meet and overlap rather than leave a clear gap between crowns. Reserve a reachable edge along the front or side of the planting for monitoring foliage, cutting back stems, and working around the row without stepping into it.
Give hollyhock full sun and moderate water in a bed that drains well. It suits an open border rather than a low, enclosed pocket where foliage remains crowded. Keep taller neighboring plants from casting shade across the row, especially once the planting is carrying its tall summer stems.
Plan hollyhock as an early- to midsummer focal point, with its height doing most of the visual work when flower stems rise above the border. As a perennial that can be short-lived, it works well in a flexible border plan: leave nearby planting pockets that can carry the composition if an individual plant is lost or shifts within the bed over time.
Keep the planting accessible and open enough to inspect leaves, since hollyhocks can be affected by rust, leaf spot, and anthracnose. Do not hide the row behind dense foreground planting or press it tightly between a wall and other tall perennials. On windy sites, allow room to add support if needed rather than relying on a narrow passage to hold stems upright.[1][2]