Houseplant growing guide
Rubber plant
Ficus elastica · Moraceae
Sun
Bright indirect
Season
Year-round indoors
Maturity
5 to 10 years
Water
Low to moderate
Soil pH
6.0 to 7.0
Spacing
Container; 6 to 10 ft tall
Planting rubber plant
Rubber plant is sold as a rooted cutting or small trunked tree, and the kindest thing you can do is repot only when the roots demand it. Pot up one size in late winter or early spring when roots circle the bottom, into a well-drained soil-based mix. Indoors it belongs near an east or west window with bright indirect light; outdoors it survives only in zones 10 to 12. Wherever it lives, choose the spot once and leave it there, because a moved rubber plant drops leaves in protest.
Planting details
- Repot in late winter or early spring, one pot size up
- Drainage holes required; empty the saucer after every watering
- Pick one bright spot and keep it; moving triggers leaf drop
- Pruned stems ooze milky latex, so wear gloves or work over a towel
- Outdoors year-round only in zones 10 to 12
Growing requirements
Bright indirect light is ideal, with a morning east window being the sweet spot; it adapts down to medium light at the cost of slower, lankier growth. Water thoroughly, then let the top couple of inches of mix dry before watering again, and cut back sharply in winter while the plant rests. It prefers humidity but tolerates ordinary dry indoor air. Keep it warm, roughly 65 to 80 F by day, and never below about 55 F or near cold drafts and heating vents. Feed with a diluted houseplant fertilizer every couple of weeks in spring and summer.
Harvesting and care
Wipe the big leaves with a damp cloth when they dull; dust blocks light and hides the gloss the plant is grown for. Prune in spring, cutting just above a node, to force branching and a bushier shape, or let it run tall and stake the trunk if it leans. Cut surfaces drip white latex that irritates skin, so protect your hands and the floor. Tips removed in pruning can be rooted or air-layered into new plants. A single lower leaf yellowing now and then is normal; a sudden shower of dropped leaves means it was moved, chilled, or overwatered.
Common mistakes
- Moving it around; leaf drop after an abrupt change of spot is the plant's signature complaint
- Overwatering or a pot without drainage, which rots roots and drops leaves
- Cold drafts and temperatures under 55 F, which blacken and drop foliage
- Direct afternoon sun, which scorches the leaves
- Pruning bare-handed over carpet; the latex sap irritates skin and stains
Companion plants
A rubber plant reads as a small indoor tree, so it anchors a cluster of smaller foliage plants like pilea, pothos, and ferns that share its bright indirect light. Give it a spot away from busy walkways, since it sulks when brushed or bumped, and keep it apart from houseplants carrying scale or spider mites, which move onto ficus readily.
Varieties worth growing
- Robusta: the standard large green leaf form and the easiest to find
- Burgundy: deep maroon leaves; needs brighter light to hold the dark color
- Tineke: cream, green, and pink variegation; slower growing and fussier about light
- Ruby: pink-flushed variegated leaves that color best near a bright window
Frequently asked questions
Why is my rubber plant dropping leaves?
Almost always an abrupt change: a new spot, a cold draft, or a watering swing. Once it settles into stable light and a dry-down watering rhythm, the drop stops and new leaves replace the loss.
How big does a rubber plant get indoors?
Easily 6 to 10 feet over several years in a bright room. Prune the growing tips in spring to keep it shorter and encourage branching.
Is rubber plant sap dangerous?
The milky latex irritates skin on contact and the plant is mildly toxic to cats and dogs if chewed. Wear gloves when pruning and keep the plant out of reach of chewers.
