How to Care for a Rubber Plant: Light, Water and Pruning

What a rubber plant is and why it is easy to keep

The rubber plant is Ficus elastica, a tropical fig from South and Southeast Asia with thick, glossy, oval leaves. Those leathery leaves lose water slowly, which is why it tolerates the dry air of a heated home better than most foliage plants. Common forms include plain green, dark burgundy and variegated types, and the variegated ones need more light to hold their colour.

It belongs to the same genus as the Chinese banyan and weeping fig sold as indoor bonsai, so it responds to the same basics: strong light, a free-draining pot and patient pruning. If you are choosing between trees, the comparison in our guide to indoor bonsai shows how a ficus fits next to other indoor species.

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Light and placement

Put the plant where it gets bright light for most of the day. A spot within a few feet of an east or south facing window works well, and a little direct morning sun is usually fine. Deep shade makes growth thin and stretched, and the lower leaves yellow and fall as the plant spends its reserves on reaching toward the light.

Turn the pot a quarter turn every week or two so the plant grows evenly instead of leaning. Keep it away from heating vents, radiators and the draft of an exterior door, because sudden temperature changes are a common cause of dropped leaves. Most growers aim to keep it above roughly 60 F (15 C) through the year.

If the room is dim, a full spectrum grow light on a timer solves the problem better than moving the plant from window to window.

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How often to water

Water when the top inch or two of soil feels dry, then water thoroughly until it runs out of the drainage holes and empty the saucer. That might be every week in a bright, warm summer room and every two to three weeks in winter, but the soil should decide, not the calendar. Push a finger in or lift the pot: a light pot means dry soil.

Overwatering is the most frequent way to lose a rubber plant. Constantly wet soil starves the roots of air, and the first signs are yellowing leaves, dark soft patches on the stem base, and leaves dropping from the bottom of the plant. A pot without drainage holes makes this almost certain. A watering can with a narrow spout lets you soak the soil without splashing the leaves and trunk.

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Soil, feeding and repotting

A chunky, fast draining mix keeps the roots healthy. Standard potting soil lightened with perlite or pumice, in roughly two parts soil to one part drainage material, is a common approach. Bonsai growers go further and use an inorganic mix, which is harder to overwater but needs more frequent watering and feeding.

Feed every two to four weeks in spring and summer with a balanced liquid fertilizer at the strength on the label or a little weaker, and stop or cut back in winter when growth slows. Never fertilize a plant that is dry or visibly stressed.

Repot into a pot one size up every two to three years, in spring, when roots circle the inside of the pot or push out of the drainage holes. A rubber plant that has stayed in the same pot for many years can also be root pruned and returned to the same container with fresh soil, which is the usual bonsai method for controlling size.

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Pruning, shaping and the milky sap

Prune in spring or early summer when the plant is growing and heals quickly. Cutting just above a leaf node makes the plant branch from that point, so a tall single stem can be turned into a fuller plant with two or three new shoots. Remove dead or crossing branches at any time of year.

All parts of the plant bleed a white latex sap when cut. It can irritate skin and is a known allergen for people with latex sensitivity, so wear gloves, protect the floor and dab the cut with a paper towel until it stops. The sap is also mildly toxic if chewed by cats and dogs, so keep the plant out of reach of pets.

Clean, sharp shears matter because crushed stems heal slowly. Large leaves do not shrink much with pruning, which means a rubber plant makes a handsome small tree but not a miniature one in the way small-leaved bonsai species can look. Wipe the leaves with a damp cloth every month or so. Dust blocks light and a clean leaf photosynthesizes better.

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Why leaves turn yellow, brown or drop

Yellow leaves that fall from the lower part of the plant usually mean too much water, too little light, or both. Check the drainage and the soil moisture before changing anything else. Brown, crispy edges point to underwatering, very dry air near a heater, or a build up of fertilizer salts, which a thorough flush with plain water can clear.

A sudden loss of several leaves after a move or a cold night is a reaction to change. Keep conditions steady and the plant normally recovers and pushes new growth in the next growing season. New leaves unfurl from a pink or red sheath at the stem tip, and it is normal for that sheath to dry and fall away.

Sticky residue, fine webbing or small cottony spots on the leaf undersides suggest scale, spider mites or mealybugs. Isolate the plant, wipe the leaves, and treat as directed on the product label.

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Frequently asked questions

How much light does a rubber plant need? Bright light for most of the day, with some direct morning sun being fine. In low light it survives but grows slowly, stretches and drops its lower leaves.

How often should I water a rubber plant? When the top inch or two of soil is dry, usually every one to three weeks depending on season, light and pot size. Water until it drains and never leave it standing in water.

Can I keep a rubber plant small? Yes. Prune back to a node in spring, trim the roots when repotting and keep it in a modest pot. It will stay a compact small tree, although the leaves stay large.

Is a rubber plant safe for pets? No. The sap and leaves are mildly toxic to cats and dogs and can irritate the mouth and skin, so place it where animals cannot chew it.