With its spectacular leaves in vibrant colors and mesmerizing patterns, the Rex Begonia , also known as the royal begonia , is a true star among houseplants. But behind its exuberant beauty hides a demanding plant, which requires specific care to flourish sustainably.
If you dream of keeping your Rex Begonia in tip-top shape all year round, follow this comprehensive care guide. From light and watering to choosing the right substrate and pest control, you'll know everything you need to become a begonia pro.
A soft, but sufficient light
The Rex Begonia likes light, but not at any cost. Unlike other houseplants, it cannot tolerate direct sunlight, which easily burns its delicate leaves. Ideally, place it near an east- or north-facing window, or behind a curtain if the light is too intense.
👉 Tip : If the colors of its leaves start to fade, it is often a sign that it lacks light.
A stable temperature, away from drafts
Native to tropical regions, the Rex Begonia prefers a constant temperature between 18 and 24°C . Cold drafts or sudden temperature changes can quickly be fatal. Therefore, avoid placing it near a door or window that is often open.
Humidity, the essential ally of Begonia Rex
This is arguably one of the most crucial elements for keeping a royal begonia healthy: humidity . This plant loves humid atmospheres, similar to those of its native forest.
💡 To increase the humidity around your plant:
- Place it on a bed of moistened clay balls,
- Use a humidifier,
- Group several plants together to create a microclimate.
Caution : Avoid spraying the leaves directly. This can cause stains and mold to appear.
Controlled watering: neither too much nor too little
Rex Begonias do not like prolonged drought or overwatering. The secret? Moderate but regular watering. The soil should remain slightly moist , but not soggy. Always allow the surface of the soil to dry between waterings.
Too much water = root rot. Too few = wilted leaves, browned edges.
A well-aerated, rich and draining substrate
To thrive, the Rex Begonia needs a light, rich, and well-drained soil . Choose a mix of houseplant potting soil with perlite, peat moss, and a little vermiculite. The idea is to provide both water retention and good aeration for the roots.
Feed your plant at the right time
During its active growth period (spring and summer), give it a balanced liquid fertilizer (10-10-10 type) every two to four weeks. In autumn and winter, reduce the amount of fertilizer significantly, or even stop it altogether.
Prune to stimulate and preserve
Pruning your begonia isn't just for aesthetics. It encourages more compact growth and prevents problems with damaged or diseased leaves. Regularly remove wilted leaves and lightly pinch the stems to encourage branching.
Repotting: a step not to be neglected
Once a year, in spring , repot your Rex Begonia into a slightly larger pot. This allows the roots to develop better and renews the substrate, which is essential for the health of the plant.
Beware of parasites!
Like many houseplants, the Rex Begonia can be attacked by scale insects, aphids, or mites . Keep a close eye on the leaves (especially the underside) and act quickly in the event of an infestation:
- With diluted black soap,
- A natural insecticide,
- Or by isolating the plant to limit its spread.
In conclusion
The Rex Begonia is arguably one of the most spectacular plants to grow indoors, but it requires attention, consistency, and observation. By providing it with a stable, bright but not overly bright, moist but well-drained environment, you'll be rewarded with unique and captivating foliage.
Take care of it, and it will transform your interior into a small colorful jungle.
