Angel wing begonias like to be kept consistently moist, and you can tell when they're lacking in water if the edge of their leaves begin to brown. Once the soil has dried about an inch from the surface, saturate the plant throughly and allow it to drain. If you plan to keep an angel wing begonia in your house, you'll want to keep temperatures up.

Signs that you need to water an angel wing begonia are when the leaf edges turn brown. Too much water in the soil will cause the roots to rot and make the beautiful leafy foliage wilt. Remember that during winter, you need to water a potted begonia houseplant less frequently.