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Rex begonia care

Begonia rex

Thirsty’s starting schedule for Rex begonia: about every 7 days. Check the soil and adjust it to your home.

Watering

Keep the compost moist but well-drained and never let it dry out completely. In winter, water less and let the surface dry first; overwatering can cause root rot. [1][2]

Light

Bright, indirect light, out of direct sun, which scorches the leaves. [1][2]

Humidity

Needs high humidity; a bathroom, kitchen or tray of wet pebbles helps, but avoid misting, which encourages disease. [1][2]

Soil and potting

Moist, well-drained soil, such as a peat-free multipurpose compost or John Innes No 2. [1][2]

Pets

Toxic to cats and dogs, causing vomiting and drooling; the underground parts are the most toxic. [3]

Sources

1. NC State Extension (Extension Gardener Plant Toolbox): Begonia – Rex Types (Painted Leaf Begonia)
2. Royal Horticultural Society: Begonias as Houseplants
3. ASPCA: Toxic and Non-toxic Plants: Rex Begonia

This page summarizes the sources above; follow them for the full picture. Light, pot, soil and season all change how fast a plant dries out, so check the soil before you water. Last reviewed October 9, 2026.