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Light: Rex begonias like bright, indirect light year-round. Because they are not aggressive bloomers, they can tolerate less light than other begonias and will thrive under fluorescent lights.
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Water: Rex begonias like even amounts of water but hate being overwatered. They also thrive on humidity but don't like direct misting, which encourages powdery mildew.
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Temperature: They like average to warm (and humid). They cannot tolerate freezing, and some types of rex begonias go into a dormant period during the fall.
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Soil: Airy, light, fast-draining soil is best.
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Fertilizer: Use liquid fertilizer weekly at quarter strength or biweekly at half strength.
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