Rex Begonia: Complete Guide for Successful Care

With its spectacular leaves in vibrant colors and hypnotic patterns, the Rex Begonia, also known as the royal begonia, is a true star among houseplants. But behind its exuberant beauty lies a demanding plant that requires specific care to thrive sustainably.

If you dream of keeping your Rex Begonia in top shape all year round, follow this comprehensive care guide. From light to watering, choosing the right substrate, and pest control, you will know everything to become a begonia pro.

Soft, but sufficient light

The Rex Begonia loves light, but not at any cost. Unlike other houseplants, it cannot tolerate direct sunlight, which easily burns its delicate leaves. Ideally, place it near a window facing east or north, or behind a sheer curtain if the light is too intense.

👉 Tip: If the colors of its leaves start to fade, it often means it is lacking 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 to it. Therefore, avoid placing it near a door or a frequently opened window.

Begonia rex ‘Maui Sunset’

Begonia rex ‘Maui Sunset’

12.00€

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Humidity, the essential ally of the Rex Begonia

This is undoubtedly 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 pebbles,

- Use a humidifier,

- Group several plants together to create a microclimate.

Caution: avoid spraying the leaves directly. This encourages the appearance of spots and mold.

Controlled watering: neither too much nor too little

The Rex Begonia does not like prolonged dryness or excess water. The secret? Moderate but regular watering. The soil should remain slightly moist, without being soggy. Always allow the surface of the soil to dry out between waterings.

Too much water = root rot.
Too little = wilted leaves, browned edges.

A well-aerated, rich, and draining substrate

To thrive, the Rex Begonia needs a light, rich, and well-draining substrate. Choose a mix of potting soil for houseplants with perlite, peat, and a bit of 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 (in spring and summer), offer it a balanced liquid fertilizer (type 10-10-10) every two to four weeks. In autumn and winter, significantly reduce feeding, or even stop it completely.

Pruning to stimulate and preserve

Pruning your begonia is not just for aesthetics. It stimulates a more compact growth and prevents issues with damaged or sick leaves. Regularly remove faded 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 in a slightly larger pot. This allows the roots to develop better and renews the substrate, which is essential for the plant's health.

Beware of pests!

Like many houseplants, the Rex Begonia can be attacked by mealybugs, aphids, or spider mites. Keep a close eye on the leaves (especially the underside) and act quickly in case of an invasion:

- With diluted black soap,

- A natural insecticide,

- Or by isolating the plant to limit the spread.

In conclusion

The Rex Begonia is undoubtedly one of the most spectacular plants to grow indoors, but it requires attention, consistency, and observation. By providing it with a stable, bright environment without excess, humid but well-drained, you will be rewarded with unique and enchanting foliage.

Take care of it, and it will transform your interior into a colorful little jungle.

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