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Indian rubberplant (Ficus elastica)

Ficus elastica is a large evergreen tree that can form aerial and buttress roots in the wild and may grow as a strangling hemiepiphyte; in temperate regions it is commonly grown as a large indoor foliage plant. It is reported to be perennial.

LightBright indirect light to partial sun is suitable for indoor cultivation, and the plant can tolerate some shade; sudden exposure to strong direct summer or afternoon sun should be avoided to reduce the risk of leaf scorch
WaterWater regularly during the growing season while avoiding overwatering and standing water; the plant can be watered thoroughly after the surface of the medium dries, with watering reduced substantially in winter or during
HumidityIt is generally reported to prefer high humidity and to need little air movement.
TemperatureBased on few sources, the reported minimum temperature is around 13 °C. Its reported hardiness corresponds to a USDA zone range, and it is generally described as frost tender; keep above freezing.
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Overview

Ficus elastica is a large evergreen tree that can form aerial and buttress roots in the wild and may grow as a strangling hemiepiphyte; in temperate regions it is commonly grown as a large indoor foliage plant. It is reported to be perennial.

Origin and habitat

Sources differ on the native range, describing it as extending from eastern South Asia into Southeast Asia, including Nepal, Bhutan, northeastern India, Bangladesh, Myanmar, Thailand, Yunnan in China, Malaysia, and Indonesia. It occurs in montane forests, particularly on cliffs and limestone hills, and may begin growth in an epiphytic state in the wild. It is adapted to tropical environments ranging from dry to moist conditions and is widely grown outdoors as an ornamental tree in tropical and subtropical areas, while being cultivated indoors in colder regions.

Characteristics

Sources differ on mature height, placing it at about 250–400 cm; the reported mature spread, based on few sources, is about 100–150 cm. Sources differ in their descriptions of the leaves: they are large, thick, leathery, glossy, and elliptic to oblong, with young plants bearing larger leaves; new leaves develop within a sheath-like structure that falls after they unfold, and plants corresponding to 'Burgundy' have reddish-black to dark foliage. The flowers occur within the characteristic enclosed inflorescences of Ficus and require specific fig wasps for pollination, while indoor plants rarely flower; the fruit is described differently by sources but is a small, elliptic fig that becomes yellow-green when mature, and reproductively viable seeds may form when suitable pollinating fig wasps are present. It is reported to grow rapidly.

Light

Bright indirect light to partial sun is suitable for indoor cultivation, and the plant can tolerate some shade; sudden exposure to strong direct summer or afternoon sun should be avoided to reduce the risk of leaf scorch.

Watering

Water regularly during the growing season while avoiding overwatering and standing water; the plant can be watered thoroughly after the surface of the medium dries, with watering reduced substantially in winter or during dormancy.

Humidity and airflow

It is generally reported to prefer high humidity and to need little air movement.

Temperature and dormancy

Based on few sources, the reported minimum temperature is around 13 °C. Its reported hardiness corresponds to a USDA zone range, and it is generally described as frost tender; keep above freezing.

Growing medium and mounting

It is generally reported to suit a loamy, moist but well-drained potting medium and can adapt to acidic, neutral, or alkaline conditions.

Feeding

Sources differ on feeding guidance: fertilizer is applied regularly during active growth, with RHS recommending a high-nitrogen fertilizer, while the growing-season frequency is not needed when growth slows in winter.

Propagation

It can be propagated by cuttings or layering, and cultivated plants are commonly produced vegetatively using methods such as cuttings and air layering.

Common problems

Indoor or greenhouse plants may be affected by spider mites, thrips, mealybugs, and scale insects. Armillaria-related disease may occur, and poor drainage may be associated with root rot. Overwatering should be avoided; strong direct summer sun may scorch leaves, low light may produce elongated growth reaching toward light, and vigorous growth can lead to crowded roots. It is sensitive to frost, low temperatures, and cold drafts, while young or indoor plants may be damaged by strong direct sunlight.

Identification

Ficus elastica has large, glossy, leathery leaves, with new leaves enclosed by red or reddish-brown stipules, and it releases white latex when injured; mature wild plants develop conspicuous aerial and supporting roots, while dark-leaved cultivated forms may have reddish-black to dark foliage.

Photos

Ficus elastica
📷 Alvesgaspar (talk) · CC BY-SA 4.0 · source
Ficus elastica
📷 VuThiAnh · CC0 · source
Ficus elastica
📷 Yoav Daniel Bar-Ness, some rights reserved (CC BY), uploaded · CC BY · source

Sources