Begonia haageana

bright indirect light (3-6 feet from a south or west window, or right next to an east window. Under a grow light, 6-10 inches away works well); avoid extended direct sun (right in the window where sun actually hits the leaves. A strong grow light 4-6 inches away can substitute) which scorches the large leaves. A well-lit east or west-facing window works well. Can handle some winter sun.

Prefers high humidity (60-80%. Group your plants together, set them on a pebble tray with water, or run a humidifier nearby) given its rainforest origins, but avoid misting (note: misting does not actually raise humidity meaningfully. A pebble tray or humidifier is more effective) directly onto the hairy leaves. Use a pebble tray or humidifier instead.

Well-draining mix rich in nutrients; a blend of peat moss (or coco coir), perlite, and sand at a pH of 5.5-6.5 is ideal.

Powdery mildew is the main disease risk, always triggered by wet foliage. Watch for mealybugs and spider mites. Leggy growth signals insufficient light.