Some growers control mildew with fungicide. Boardman uses a spray or drench of 2 teaspoons baking soda per gallon of water, applied as needed every four to five days. Don't crowd plants. Remove dead leaves and debris. Control mealybugs, a common houseplant pest, by dabbing or spraying with insecticidal soap or a mixture of rubbing alcohol and water.
Many begonias are easy to propagate.
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