Willowleaf Buttonbush Plant Care

Willowleaf Buttonbush (Cephalanthus salicifolius) belongs to the Rubiaceae family within the Cephalanthus genus. Willowleaf Buttonbush is also known as River Buttonbush.

Willowleaf Buttonbush displays an upright, multi-stemmed shrub growth habit, reaching up to 6 ft tall with a spread of approximately 6 ft. Willowleaf Buttonbush produces globular, creamy-white flowers in dense clusters.

Leaf size: approximately 4 inches.

Water a young or newly planted Willowleaf Buttonbush every 7–10 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established trees mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Willowleaf Buttonbush thrives in full sun to part shade.

Cephalanthus salicifolius tolerates temperatures of 60–85°F. Willowleaf Buttonbush prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Moist, acidic, well-draining soil with high organic content. Good drainage is essential for Willowleaf Buttonbush to prevent waterlogging, which leads to root rot and fungal issues.

Feed Willowleaf Buttonbush every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established trees in good soil often need little extra feeding, so let weak growth or pale foliage guide you.

Stop feeding by late summer so new growth can harden before winter.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Choose a spot with full sun to part shade and moist, acidic, well-draining soil with high organic content. Avoid low spots where water collects after rain.

Willowleaf Buttonbush is suited to USDA Zone 13a.

Plant container-grown or balled-and-burlapped trees in spring or early autumn, setting the root flare at soil level, and water well after planting.

Willowleaf Buttonbush can spread to about 6 ft (1.8 m) and reach about 6 ft (2 m) tall. Space plants about 6 ft (1.8 m) apart so mature crowns don't crowd each other, and plant at least half that distance from buildings, fences and paths.

Planning a row or hedge? Try the tree spacing calculator.

Prune Willowleaf Buttonbush while it is dormant in late winter: first remove dead, damaged and crossing branches, then thin lightly for shape.

If it flowers in spring, prune right after flowering instead so you don't remove next year's buds. Never take off more than about a quarter of the tree in one year.

Willowleaf Buttonbush is frost-tender (hardy to USDA zone 13). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Willowleaf Buttonbush can be propagated through softwood cuttings, seeds. Similar propagation techniques also apply to cephalanthus glabratus plant care, which shares the same genus.

See all plants toxic to cats and plants toxic to dogs.

Willowleaf Buttonbush is susceptible to aphids, scale insects, spider mites. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

Willowleaf Buttonbush grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. In cooler regions, grow Willowleaf Buttonbush as a houseplant or bring it indoors before the first frost.