Baby rubber plant

Identification and origin

Peperomia obtusifolia belongs to the pepper family, Piperaceae. Its native range runs from South Florida and the Caribbean through Mexico and Central America to northern South America, as far as Peru, Bolivia and Brazil. The epithet obtusifolia means “blunt-leaved,” referring to leaves rounded at the tip.

It is an herbaceous perennial with an upright, then spreading, bushy and rounded habit. Its branched, fleshy stems are often tinged pink or red, as are the leaf stalks. The alternate, obovate leaves are slightly cupped like a spoon, thick, waxy and glossy, and measure 3–6 in; they are dark green in the species, and many cultivars mottle them with cream, gray or gold (‘Variegata’, ‘Gold Tip’, ‘Alba’, ‘Minima’, ‘USA’). In a pot it reaches 6 in – 2 ft depending on age and conditions, most often around 12 in. The tiny, petal-less flowers are packed onto slender, upright cream spikes 4–5 in long; flowering is erratic, mainly in late summer, and easy to overlook.

Light

Bright, indirect light suits it best: near an east window or set back from a south window; it will also make do by a large north-facing window. Sun that is too strong or direct burns the leaves, though soft winter sun is welcome. It can go several months in low light without stress; over time, too much shade gives stretched, sparse stems.

Watering

Let the mix partly dry out between waterings and check with your finger before watering rather than following a calendar. Water thoroughly, let it drain, then set the pot back in an empty saucer: it will not tolerate soggy soil. Its fleshy leaves store water, but it doesn’t like staying bone-dry for too long either. In winter, when growth slows, water much less often. Fluoride in tap water can brown the leaf tips, so use rainwater or filtered water at room temperature when you can.

It adapts to household air, enjoys fairly high humidity in summer and benefits from a humidifier when indoor heating dries the air in winter.

Potting mix

A well-drained houseplant mix or a cactus mix; a mix rich in organic matter lightened with perlite and fine bark also works. The pot must have drainage holes. Feed only in spring and summer, with a weak liquid fertilizer now and then or a single yearly dose of slow-release fertilizer.

Temperature

It is happy in a warm room, between 64–86 °F. Don’t let it drop below about 59 °F, and keep it away from cold air from doors or vents as well as from radiators. It can summer outdoors once nights stay reliably above 61 °F, first in deep shade to acclimate, then in a bright spot out of direct sun. In the ground it is only grown year-round in USDA zones 10 to 12.

Repotting

There’s no rush: it can stay in the same pot for several years. Repot every two or three years in spring, once roots fill the container, into a pot only slightly larger than the root ball.

Pruning

Remove damaged or old leaves as needed. For a bushier, denser plant, cut overlong stems just above a node; the pieces you remove make excellent cuttings.

Propagation

Very easy in spring and summer:

• Stem cuttings 3–5 in long: strip the lower leaves, dip the base in rooting hormone if you like, and plant in a light mix.
• In water: pieces 4–6 in long, cut just below a node, root readily.
• Leaf cuttings: take a leaf with at least 1 in of leaf stalk and insert it in the mix.
• Division and seed are also possible.

Common problems

• Yellow leaves, leaf drop: very often overwatering, which leads to root and stem rot.
• Leaf spots: fungal diseases encouraged by wet leaves; water the soil, not the foliage.
• Scorch: sun that is too direct; brown tips: dry air or fluoridated water.
• Pests: mealybugs, scale, spider mites, whiteflies and fungus gnats.

One symptom can have several causes: check watering, light, temperature and pests before treating.

Toxicity

No toxicity has been reported: it is listed as non-toxic to dogs and cats. Still, as with any plant, a pet that eats the leaves may have a mild, passing stomach upset.