California Sycamore Plant Care

California Sycamore (Platanus racemosa) belongs to the Platanaceae family within the Platanus genus. California Sycamore is native to California and Baja California. California Sycamore is also known as Western Sycamore.

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

Leaf size: approximately 8 inches.

Water a young or newly planted California 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.

California Sycamore thrives in full sun to partial shade.

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

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

Feed California 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.

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.

California 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 California 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.

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.

California Sycamore can be propagated through seeds, root cuttings. Similar propagation techniques also apply to american sycamore plant care, which shares the same genus.

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California 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.