Polka Dot Begonia

Check your light →

Happiest near a window where the rays don’t land, though a little gentle sun, like an early morning hour, suits it. Clemson warns that too much sun can fade a cane begonia’s dots and scorch its leaves.

Those silver spots are the part worth protecting. An east window gives it the soft morning hour it handles, and wherever afternoon glare would reach it, a sheer curtain keeps the dots from washing out. Keep it in good light, though, since too little can make it drop leaves (RHS).

Come June, it can summer on a shaded Chicago porch: Clemson suggests cane-type angel wing begonias can spend summer outdoors in partial shade. Bring it in well before fall nights turn cold, since it’s hardy only in zones 10-11 (NC State).

Its home ground is the wet tropics of southeastern Brazil (Kew). Indoors, give light generously, so long as the glare stays off those spotted wings.

Every 5-7 days in summer and 7-10 in winter, in soil that stays moist but drains freely, and it likes humid air. Missing a day or two is forgivable: NC State lists cane begonias as drought-⁠resistant.

Humidity is what it notices most. Cane begonias do best in high humidity (NC State), and a Chicago apartment with the radiators running in January offers very little of it.

If its wings look tired by February, set it among other plants or add some moisture to the air nearby. Dry air is one of the two usual reasons a begonia struggles indoors, alongside overwatering (RHS), so a little extra moisture in the air goes a long way through winter.

Gone for a while? A week is about its limit: soak it the day you leave and move it back from the window.

Jointed canes 1-3 feet tall, lined with spotted, wing-⁠shaped leaves. Pretty on a stand or a low table; pinch the tips now and then to keep it full instead of lanky.

Its stems are built in segments, with swollen joints that NC State compares to bamboo. Left alone, cane begonias tend to drop their lower leaves as they climb, leaving bare stalks at the base (NC State).

Those joints are where new plants start: a snipped tip, cut just below one, may root in water or moist soil, and NC State names stem cuttings as the easiest method. The species also grows from seed, though hybrids don’t come true to their parents.

Because the canes stretch upward and shed from the bottom, it reads as a slim column with its spotted wings held up top, a fit beside a bookcase or in a corner too narrow for a bushy plant.

A dog or cat that chews it may drool or vomit, and it usually passes. For kids, CHOP and Poison Control list begonias as non-poisonous, though the sap can irritate skin, so rinse hands after handling.

The roots carry more of the irritant than the leaves and stems, per the ASPCA and NC State.

Begonias carry soluble calcium oxalates (ASPCA), and the signs listed for dogs and cats are drooling and vomiting. NC State rates begonias low in severity overall. If symptoms don’t settle, or anything worries you, call your vet or the ASPCA Animal Poison Control Center (a fee may apply).

For children, there’s nothing to do after a nibble. Poison Control is still a call away if you’d like the reassurance.

A begonia can share a home with pets. A heavy pot on a stand, or a shelf a cat can’t reach, keeps leaves and soil away from chewers, and gloves spare your hands from the sap when you take cuttings.

1. ASPCA: mild for dogs (rates the whole genus).
2. ASPCA: mild for cats (rates the whole genus).
3. CHOP: safe for kids.

Cats and dogs: Most of the leading sources agree.

Kids: CHOP and Poison Control list it as non-poisonous. Its sap can irritate skin or eyes.

Happiest at 66-73°F, and it shouldn’t sit below 55°F. Keep it away from cold glass in winter. It wants at least 40% humidity.

Temperature

66-73°F

Mealybugs hide in leaf axils, stem nodes, and under leaves, while whiteflies and spider mites stay on the undersides. Thrips are occasional, in new growth and flowers. Flip a few leaves each week.

• Mealybugs
• Whiteflies
• Spider mites
• Thrips

More than most. NC State and Clemson list mealybugs, whiteflies, thrips, and spider mites, plus powdery mildew and rot.

Mealybugs look like tufts of white cotton where the leaves meet the canes. Wipe them off with a cotton swab dipped in rubbing alcohol, then check again next week.

Whiteflies are tiny white moths that flutter up when you brush the leaves; spider mites and thrips leave the leaves speckled and dull. Rinse the plant, then spray insecticidal soap, especially under the leaves.

Powdery mildew looks like white powder dusted on the leaves. Cut off the worst leaves, give it more air around it, and keep water off the foliage (NC State).

Botrytis (a gray fuzz) and stem rot come with wet leaves and soggy soil. Cut the affected parts away and let the soil dry a little more between soaks, which takes 5-7 days.

Feed at half strength on alternate waterings through spring and summer. Pinch tips twice a year, clear faded flowers and yellow leaves about 4 times, and stake canes as they lengthen. Prune and repot in spring.

• Feed12× a year
• Prune1× a year
• Pinch2× a year
• Stake1× a year
• Deadhead4× a year
• Repot1× a year

A pot with a drainage hole and a rich potting mix that holds moisture but drains fast; NC State says moist, well-drained, and high in organic matter.

Repot when the roots fill the pot, in spring, one pot size up.

Feed it while it’s growing: a balanced liquid fertilizer at half strength every other watering (Clemson), and not in winter, when it slows down.

Each wing-shaped leaf is scattered with silver polka dots, bold against the green. The surface has a gentle gloss, and the leaves along the canes leave some soil still showing.