American Sycamore Plant Care

American Sycamore (Platanus occidentalis) belongs to the Platanaceae family within the Platanus genus. American Sycamore is native to the eastern and central United States, the mountains of northeastern Mexico, extreme southern Ontario, and extreme southern Quebec. American Sycamore is also known as Buttonwood, Buttonball Tree, American Plane.

American Sycamore displays a large deciduous tree growth habit, reaching up to 100 ft tall with a spread of approximately 80 ft. American Sycamore produces inconspicuous greenish-yellow flowers.

Leaf size: approximately 8 inches.

Water a young or newly planted American Sycamore 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.

American Sycamore thrives in full sun to partial shade.

Platanus occidentalis tolerates temperatures of 0–100°F. American Sycamore prefers humidity levels of 40–70%.

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

Feed American Sycamore 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 to partial shade and moist, well-draining soil with high organic content. Avoid low spots where water collects after rain.

American Sycamore is suited to USDA Zone 4a – 9a.

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.

American Sycamore can spread to about 80 ft (24.4 m) and reach about 100 ft (30 m) tall. Space plants about 80 ft (24.4 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 American Sycamore 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.

American Sycamore is hardy down to USDA zone 4a, 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.

American Sycamore can be propagated through seeds, root cuttings.

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

American Sycamore is susceptible to sycamore lace bug, powdery mildew. 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.

American Sycamore grows outdoors in USDA Zone 4a – 9a. It survives winters down to planting zone 4a. American Sycamore is native to the eastern and central United States, the mountains of northeastern Mexico, extreme southern Ontario, and extreme southern Quebec.