Panama Rubber Tree Plant Care

Panama Rubber Tree (Castilla elastica subsp. gummifera) belongs to the Moraceae family within the Castilla genus. Panama Rubber Tree is native to Mexico, Guatemala. Panama Rubber Tree is also known as Mexican Rubber Tree.

Panama Rubber Tree displays a tall canopy tree growth habit, reaching up to 30 ft tall with a spread of approximately 20 ft. Panama Rubber Tree produces small inconspicuous flowers in clusters.

Leaf size: approximately 6 inches.

Water a young or newly planted Panama Rubber Tree 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.

Panama Rubber Tree thrives in full sun to partial shade.

Castilla elastica subsp. gummifera tolerates temperatures of 65–85°F. Panama Rubber Tree prefers humidity levels of 50–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Well-draining loamy soil with added organic matter like compost or peat moss. Good drainage is essential for Panama Rubber Tree to prevent waterlogging, which leads to root rot and fungal issues.

Feed Panama Rubber Tree 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 partial shade and well-draining loamy soil with added organic matter like compost or peat moss. Avoid low spots where water collects after rain.

Panama Rubber Tree is suited to USDA Zone 10b – 12b.

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.

Panama Rubber Tree 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 Panama Rubber Tree 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.

Panama Rubber Tree is frost-tender (hardy to USDA zone 10). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Panama Rubber Tree can be propagated through seeds, air layering. Similar propagation techniques also apply to panama rubber tree plant care, which shares the same genus.

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

Panama Rubber Tree is susceptible to mealybugs, 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.

Panama Rubber Tree grows outdoors in USDA Zone 10b – 12b. It survives winters down to planting zone 10b. Panama Rubber Tree is native to Mexico, Guatemala. In cooler regions, grow Panama Rubber Tree as a houseplant or bring it indoors before the first frost.