Clammy Locust Plant Care

Clammy Locust (Robinia viscosa) belongs to the Fabaceae family within the Robinia genus. Clammy Locust is native to the southeastern United States. Clammy Locust is also known as Sticky Locust, Swamp Locust.

Clammy Locust displays a fast-growing tree growth habit, reaching up to 30 ft tall with a spread of approximately 20 ft. Clammy Locust produces showy clusters of fragrant white or pink flowers.

Leaf size: approximately 6 inches.

Water a young or newly planted Clammy Locust every 7–14 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.

Clammy Locust thrives in full sun.

Robinia viscosa tolerates temperatures of 0–100°F. Clammy Locust prefers humidity levels of 30–70%.

Well-draining loamy soil with good fertility. Good drainage is essential for Clammy Locust to prevent waterlogging, which leads to root rot and fungal issues.

Feed Clammy Locust every 8 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 and well-draining loamy soil with good fertility. Avoid low spots where water collects after rain.

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.

Clammy Locust can spread to about 20 ft (6.1 m) and reach about 30 ft (9 m) tall. Space plants about 20 ft (6.1 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 Clammy Locust 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.

Water deeply in late autumn before the ground freezes, and spread a 5–8 cm (2–3 in) layer of mulch over the root zone, keeping it away from the trunk.

Young and container-grown trees need extra protection: roots in a pot freeze much more easily than roots in the ground.

Clammy Locust can be propagated through seeds, root cuttings. Similar propagation techniques also apply to robinia × holdtii plant care, which shares the same genus.

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

Clammy Locust is susceptible to aphids, caterpillars, leafhoppers. 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.