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Indoor plant care

Rex Begonia

Begonia rex-cultorum

• LightRex Begonia needs bright indirect light at 150 to 250…
• WaterKeep Rex Begonia evenly moist, but do not leave its soil…
• ToxicityToxic to pets
• Mature sizeIt eventually reaches 12 to 18 in / 30…

Rex Begonia is grown mainly for dramatic foliage rather than flowers. Its leaves vary widely in shape, color, and surface texture. Depending on the cultivar, they may show metallic highlights, velvet-like surfaces, or sharp graphic patterns. This compact plant adds strong color to shelves and tabletops. It suits attentive growers who can provide filtered light, steady moisture, and good humidity without soaking the roots.

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Care data checked 25 September 2026 · Dany · A-Z Plants

Light requirements

Rex Begonia needs bright indirect light at 150 to 250 μmol·m⁻²·s⁻¹ PPFD. A PAR meter or app can be used to check the available light.

• Placement: position it 5 ft / 1.5 m from a south, west, or east-facing window.
• Prevent a direct view of the sky. Filter unavoidable sunlight with a sheer curtain.
• Too much light: leaves may bleach, scorch, or lose their rich colors.
• Too little light: growth becomes weak, and the foliage may look dull or less patterned.

Watering

Keep Rex Begonia evenly moist, but do not leave its soil soggy. A knitting needle or chopstick can test moisture at different depths. Use room temperature rainwater, distilled water, or reverse osmosis water.

• Water the root ball thoroughly until liquid runs through the drainage holes.
• Allow the pot to finish draining before returning it to a saucer or decorative planter.
• Reduce watering considerably during winter when active growth slows.
• Waterlogged soil can cause root or stem rot. Soil that gets too dry may produce wilted leaves and crisp edges. A pot with drainage holes is essential for maintaining the right balance.

Soil

Use an organic all-purpose potting mix that stays lightly moist while allowing excess water to escape. Rex Begonia has fine roots that can decline in heavy, waterlogged soil.

• DIY mix: combine 3 parts coir with 1 part pumice.
• Apply worm castings as a top dressing rather than making the mix overly rich or dense.

Feeding

Feed Rex Begonia with an organic all-purpose fertilizer every 2 to 4 weeks from March to October. Apply the indoor-plant strength shown on the label. Avoid overfeeding, and stop the regular schedule in winter when growth and water use decline.

Temperature & humidity

Rex Begonia prefers 60 to 70 °F / 15.5 to 21 °C. Keep conditions stable and protect the foliage from cold drafts. Aim for 50% humidity. The plant benefits from moist air, but the soil and leaves should not remain constantly wet.

What to expect

Rex Begonia grows fairly quickly under stable indoor conditions and can mature in 1 to 2 years. It eventually reaches 12 to 18 in / 30 to 45 cm in height. Its foliage mound commonly spreads 12 to 18 in / 30 to 45 cm.

Varieties & cultivars

• B. rex-cultorum ‘Fairy’: Silver leaves are marked with cream and pink spatters.
• B. rex-cultorum ‘Rumba’: Red-green foliage carries contrasting silver variegation.
• B. rex-cultorum ‘Pink Charming’: Pink and green leaves are flecked with silver.
• B. rex-cultorum ‘Tornado’: Dark green foliage displays bronze, silver, and deep purple highlights.
• B. rex-cultorum ‘Duarten’ and B. rex-cultorum ‘Ballet’: ‘Duarten’ has pointed leaves with silver and bronze stripes. ‘Ballet’ has silver-green leaves, mid-green margins, and red stems.