light
Rex begonias prefer bright, indirect light, and will tolerate medium light. Keep away from direct sunlight as leaves may burn.
soil
Plant in all-purpose potting soil or step-up your game with a terrestrial mix; 2-3 parts all-purpose potting soil, 1 part vermiculite, 1/2 part worm castings.
water
Keep soil evenly moist. Rex Begonias do not like to dry out completely.
fertilizer
Fertilize with an all-purpose fertilizer weekly during active growth. A bloom booster will encourage blooms.
tips and troubleshooting
Rex Begonias are rhizomatous and can be easily propagated by rhizome division. New plants will also sprout from leaf tip cuttings.