Rex Begonia Plant Care: What to Know

Learn how to grow Rex begonia in your indoor garden and get this lovely flowering plant to thrive. With the proper TLC, Rex begonia can light up your indoor garden with gorgeous leaves and lovely flowers. Find out proper lighting, watering, fertilizing, humidity, and more. See care time stamps below.

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Video Transcript

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Today we have a plant care video for this lovely Rex Begonia (botanically Begonia Rex Cultorum). It is a stunning houseplant known for its vibrant, colorful foliage. This species is native to the tropical and subtropical regions of eastern Asia, particularly India and southern China.

This species has been extensively hybridized, resulting in a wide array of cultivars with diverse leaf patterns and colors. The cultivar featured here is called Miami Storm—a very pretty plant with intricate and vibrant leaves.

The most striking feature of Rex Begonia is its large, patterned leaves, which can display colors including reddish-pink, green, silver, and purple. Leaves may be smooth to slightly fuzzy, adding to its visual appeal. The plant generally grows low and compact in a mounded form, but can reach a substantial size. It also produces lovely blooms, though most grow it for its foliage.

Lighting

Provide bright, indirect light.
Place 2–3 feet away from a southern-facing window or in front of an eastern window until mid-day.
Full spectrum lighting works well for 14–16 hours a day, especially in fall and winter.

Watering

Keep soil consistently moist but not waterlogged.
Water when the top inch of soil dries. Use a moisture meter reading 4 as a guide.
Use distilled, reverse osmosis, or rainwater to prevent brown leaf tips.
Signs of underwatering: curly or wilting leaves, dry edges.
Signs of overwatering: mushy stems, yellowing leaves, fungal growth.

Fertilizing

Feed monthly from spring through early fall with a well-balanced organic fertilizer for houseplants.

Humidity

Rex Begonias thrive in 50–80% humidity.
Increase humidity using pebble trays, misting, humidifiers, or grouping plants.
Signs of low humidity: crispy, curling leaves, slowed growth, or loss of vibrancy.

Temperature

Ideal: 60–75°F. Can tolerate up to 80°F briefly.
Avoid temperatures below 60°F or drastic fluctuations.
Keep away from heating or AC vents to prevent drying.

Repotting

Use wide, shallow pots with excellent drainage.
Ideal soil: peat moss, perlite or pumice, vermiculite, compost, and other organic nutrients.

Pruning

Remove dead or dying foliage.
Pinch off spent flowers.

Pests & Diseases

Overwatering can cause fungal infections, root rot, and mushy stems.
Reduce watering if fungal issues arise.

Propagation

Propagate by leaf/stem cuttings or rhizome division in spring and early summer.
Keep cuttings humid under a humidity dome.

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FAQ's -Rex Begonia Care: What to Know 101

Rex Begonia Care FAQ

What light conditions does Rex Begonia need?

Rex Begonias require bright, indirect light. Place them 2–3 feet from a southern-facing window or in front of an eastern window until mid-day. Full spectrum lighting for 14–16 hours works well, especially during fall and winter.

How often should I water my Rex Begonia?

Water when the top inch of soil has dried and the pot feels lightweight. Avoid overwatering to prevent fungal diseases. Using distilled or rainwater helps prevent brown leaf tips.

What is the ideal humidity for Rex Begonia?

Rex Begonias thrive in 50–80% humidity. Increase humidity using pebble trays, regular misting, grouping plants together, or a humidifier.

What temperatures are suitable for Rex Begonia?

Keep Rex Begonias in temperatures between 60–75°F. They can tolerate short periods up to 80°F but do poorly below 60°F or with fluctuating temperatures.

How do I fertilize Rex Begonia?

Feed monthly from spring through early fall with a well-balanced organic fertilizer designed for houseplants.

How should I repot my Rex Begonia?

Use wide, shallow pots with excellent drainage. A lightweight potting mix with peat moss, perlite or pumice, vermiculite, compost, and other organic nutrients is ideal.

Do Rex Begonias need pruning?

Prune by removing dead or dying foliage at the base and pinch off spent flowers as needed.

What pests or diseases affect Rex Begonia?

Overwatering can cause fungal pathogens like root or crown rot, leading to mushy stems and gray leaves. Reduce watering and treat accordingly if symptoms appear.

How can I propagate Rex Begonia?

Propagate through leaf and stem cuttings or rhizome division during spring and early summer. Keep cuttings humid under a humidity dome during rooting.