Caspian locust Plant Care

Caspian locust (Gleditsia caspica) belongs to the Fabaceae family within the Gleditsia genus. Caspian locust is native to western Asia, in the Caucasus region of Azerbaijan and northern Iran, close to the Caspian Sea. Caspian locust is also known as Honey locust.

Caspian locust displays a medium to large deciduous tree growth habit, reaching up to 50 ft tall with a spread of approximately 30 ft. Caspian locust produces small greenish-yellow flowers in clusters.

Leaf size: approximately 6 inches.

Water a young or newly planted Caspian 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.

Caspian locust thrives in full sun.

Gleditsia caspica tolerates temperatures of 20–100°F. Caspian locust prefers humidity levels of 40–70%.

Well-draining loamy soil with good organic content. Good drainage is essential for Caspian locust to prevent waterlogging, which leads to root rot and fungal issues.

Feed Caspian 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 organic content. Avoid low spots where water collects after rain.

Caspian locust is suited to USDA Zone 6a – 9b.

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.

Caspian locust can spread to about 30 ft (9.1 m) and reach about 50 ft (15 m) tall. Space plants about 30 ft (9.1 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 Caspian 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.

Caspian locust is hardy down to USDA zone 6a, so once established it can stay outdoors through winter in that zone and warmer ones.

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.

Caspian locust can be propagated through seeds, grafting. Similar propagation techniques also apply to false water locust plant care, which shares the same genus.

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

Caspian locust is susceptible to aphids, caterpillars, scale insects. 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.

Caspian locust grows outdoors in USDA Zone 6a – 9b. It survives winters down to planting zone 6a. Caspian locust is native to western Asia, in the Caucasus region of Azerbaijan and northern Iran, close to the Caspian Sea.