Rex Begonia – How to Grow and Care as a Houseplant


Updated: 11 Jul, 2023

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Rex Begonias, known for their stunning foliage, are popular houseplants cherished for their vibrant colors and unique leaf patterns. These plants belong to the Begoniaceae family and are native to tropical regions in Asia and South America. With their distinctive asymmetrical leaves, Rex Begonias have become a favorite among plant enthusiasts and collectors alike.

One of the most alluring features of Rex Begonias is the remarkable diversity in leaf shapes, sizes, and colors. The leaves can display intricate patterns of silver, purple, green, pink, and burgundy, often adorned with swirls, spots, or veins that create a mesmerizing display. Due to their stunning foliage, Rex Begonias are often referred to as “painted-leaf begonias.”

Growing Rex Begonias as houseplants can be a rewarding experience, as they are relatively easy to care for. These plants thrive in bright, indirect light, making them suitable for indoor settings. However, they should be protected from direct sunlight, which can scorch their delicate leaves. Ideally, placing them near east or west-facing windows is ideal to provide them with the right amount of light.

How to Plant your Rex Begonia?

To plant your Rex Begonia, follow these steps:

  1. Select a suitable pot: Choose a pot with drainage holes to ensure proper drainage and prevent waterlogging. The size of the pot should accommodate the current root system with a little room for growth.

  2. Prepare the potting mix: Rex Begonias prefer well-draining soil. You can create a suitable mix by combining equal parts of peat moss, perlite, and a quality potting soil. This mix helps retain moisture while allowing excess water to drain away.

  3. Fill the pot: Fill the pot about one-third to one-half full with the prepared potting mix.

  4. Prepare the plant: Gently remove the Rex Begonia plant from its nursery container, taking care not to damage the delicate roots or foliage. If the roots are tightly bound, you can gently loosen them to encourage healthy growth.

  5. Planting the begonia: Place the plant in the center of the pot, ensuring that the crown (where the stems emerge from the soil) sits slightly above the soil level. Add more potting mix around the roots, gently firming it in place. Leave a small gap between the soil surface and the rim of the pot to allow for watering.

  6. Water thoroughly: After planting, water the begonia thoroughly, allowing the water to flow through the drainage holes. This helps settle the soil and ensures that the roots make good contact with the growing medium.

  7. Positioning the plant: Place the pot in a location with bright, indirect light. Avoid direct sunlight, as it can scorch the begonia’s foliage. East or west-facing windows are usually ideal.

  8. Maintain humidity: Rex Begonias prefer high humidity. To increase humidity around the plant, you can mist the leaves regularly or place a tray filled with water and pebbles beneath the pot. As the water evaporates, it creates a humid microclimate.

  9. Watering routine: Water your Rex Begonia when the top inch of soil feels dry. Insert your finger into the soil to check the moisture level. Be careful not to overwater, as it can lead to root rot. Ensure the pot has good drainage to allow excess water to escape.

  10. Temperature and humidity considerations: Rex Begonias thrive in warm temperatures between 65-75°F (18-24°C). They also prefer higher humidity levels, ideally around 50-60%. Avoid placing them near drafts or areas with fluctuating temperatures.

  11. Fertilizing: Feed your Rex Begonia with a balanced liquid fertilizer diluted to half-strength once a month during the growing season (spring and summer). Reduce or stop fertilization during the dormant period (fall and winter).

By following these planting guidelines and providing the proper care, your Rex Begonia should grow and flourish, displaying its stunning foliage for you to enjoy.

(Begonia Rex-Cultorum) Description and Features

Begonia Rex-Cultorum, commonly known as Rex Begonia or King Begonia, is a popular hybrid cultivar of the Begonia genus. It is prized for its ornamental foliage, which showcases a wide range of colors, patterns, and textures. The name “Rex” refers to the regal appearance of the plant, emphasizing its royal beauty.

The leaves of Begonia Rex-Cultorum are the main attraction, as they come in an array of striking designs. The foliage can display intricate patterns such as swirls, dots, stripes, and spirals. The leaf coloration is incredibly diverse, ranging from vibrant shades of green, red, pink, and silver to deep burgundy, bronze, and purple. Some varieties even have iridescent or metallic sheens, further enhancing their visual appeal.

One of the distinct features of Begonia Rex-Cultorum is the asymmetrical shape of its leaves. They are typically large, broad, and deeply lobed, adding to the plant’s overall dramatic effect. The leaf margins can be smooth or serrated, depending on the variety.

In addition to their captivating foliage, Rex Begonias often produce small, inconspicuous flowers. The flowers are secondary to the foliage and are usually white, pink, or red in color. However, they are not the primary reason for growing Rex Begonias, as their ornamental value lies primarily in their leaves.

These begonias are compact plants, usually reaching a height of around 12 to 18 inches (30 to 45 cm), making them ideal for indoor cultivation. They are commonly grown as houseplants or in shaded outdoor gardens in temperate climates.

Begonia Rex-Cultorum plants are known for their relatively easy care requirements. They prefer bright, indirect light, but they should be protected from direct sunlight, which can scorch their delicate leaves. They thrive in warm temperatures and high humidity levels, making them suitable for tropical or subtropical regions.

With their stunning foliage and unique features, Begonia Rex-Cultorum plants add a touch of elegance and beauty to any indoor or shaded outdoor space. Their exceptional leaf patterns and colors make them highly sought-after among plant enthusiasts and collectors, allowing them to be showcased as striking ornamental plants.

Rex Begonia Care

Growing and caring for Rex Begonias involves providing the right conditions and proper maintenance. Here are some guidelines to help you:

Light requirements:

Rex Begonias prefer bright, indirect light. Place them near east or west-facing windows where they can receive filtered sunlight. Avoid direct sunlight, as it can scorch their delicate leaves. If the light is too dim, the foliage may lose its vibrant colors.

Temperature and humidity:

Rex Begonias thrive in warm temperatures between 65-75°F (18-24°C). They also prefer higher humidity levels, ideally around 50-60%. To increase humidity, mist the leaves regularly or place a tray with water and pebbles beneath the pot. Avoid placing them in areas with drafts or sudden temperature fluctuations.

Watering:

Water Rex Begonias thoroughly when the top inch of soil feels dry. Insert your finger into the soil to check the moisture level. Ensure the pot has good drainage to allow excess water to escape. Avoid overwatering, as it can lead to root rot. It’s better to underwater slightly than to overwater.

Soil and potting:

Use a well-draining potting mix for Rex Begonias. A mix of peat moss, perlite, and quality potting soil works well. Ensure the pot has drainage holes to prevent waterlogging. Transplant the plant to a slightly larger pot when it becomes root-bound.

Fertilizing:

Feed your Rex Begonia with a balanced liquid fertilizer diluted to half-strength once a month during the growing season (spring and summer). Follow the instructions on the fertilizer package for proper dilution and application. Reduce or stop fertilization during the dormant period (fall and winter).

Pruning and grooming:

Remove any yellowing or dead leaves regularly to maintain the plant’s appearance and prevent the spread of diseases. You can also pinch back the stems to encourage bushier growth. Pruning should be done with clean, sharp tools.

Pests and diseases:

Rex Begonias can be susceptible to pests like aphids, spider mites, and mealybugs. Inspect the plant regularly for signs of infestation, such as webbing, distorted leaves, or sticky residue. Treat any pest problems promptly with organic insecticides or insecticidal soap. Ensure good airflow around the plant to prevent fungal diseases.

Dormancy:

Rex Begonias may enter a period of dormancy during the fall and winter months. During this time, reduce watering and allow the top layer of soil to dry out slightly between waterings. Place the plant in a slightly cooler location (around 60-65°F or 15-18°C) during dormancy.

How to Propagate the Rex Begonia?

While growing Rex Begonias from seeds is possible, it’s important to note that the seeds are tiny and can take a considerable amount of time to mature into rhizomes. Therefore, a more efficient and simpler method of propagation is by taking leaf cuttings.

To propagate Rex Begonias through leaf cuttings, start by selecting a healthy leaf with a section of stem attached to it. Place the cutting in a container with water, ensuring that the stem is submerged while the leaf remains above the waterline. Wait for roots to develop from the submerged stem.

Once you observe a good root system, prepare a potting mix of moist peat moss and perlite. Plant the cutting in the potting mix, ensuring that the leaf remains intact. As the cutting grows, new leaves will begin to emerge.

Once you notice the growth of new leaves, you can remove the original leaf. Within approximately two months, the new plant should mature and establish itself. Alternatively, you can skip the water rooting step and plant the cuttings directly into a mixture of perlite and moist peat moss, keeping them consistently moist until new leaves sprout.

After removing the original leaf, transplant the new Rex Begonia plant into an appropriate pot filled with fresh potting soil. Ensure the soil is well-draining to prevent waterlogging.

Common Diseases/Pests

Rex Begonias are generally resistant to many diseases and pests, but they can occasionally encounter a few common issues. Here are some of the common diseases and pests that may affect Rex Begonias:

  1. Powdery Mildew: Powdery mildew appears as a white, powdery coating on the leaves, stems, and flowers. It thrives in high humidity and can be caused by poor air circulation or excessive moisture. Fungicidal sprays or horticultural oils can help control the spread of powdery mildew.

  2. Botrytis Blight: Botrytis blight, also known as gray mold, appears as gray-brown fuzzy patches on leaves, stems, and flowers. It thrives in cool, damp conditions and can spread rapidly. Remove affected plant parts and improve air circulation to prevent the disease. Fungicidal sprays can be used if the problem persists.

  3. Pythium Rot: Pythium rot causes the roots to rot and the plant to wilt. It is often caused by overwatering and poorly draining soil. To prevent pythium rot, ensure proper drainage, avoid overwatering, and use well-draining soil. Affected plants may need to be discarded to prevent the spread of the disease.

  4. Aphids: Aphids are small, soft-bodied insects that feed on the sap of plants. They can cause leaf distortion, stunted growth, and the production of sticky honeydew. Use insecticidal soap, neem oil, or a strong jet of water to remove aphids from the plant.

  5. Spider Mites: Spider mites are tiny pests that can cause stippling on the leaves, webbing, and overall decline of the plant. They thrive in dry conditions. Regularly misting the leaves and using insecticidal soap or neem oil can help control spider mite infestations.

  6. Mealybugs: Mealybugs are small, white insects that form cottony clusters on the undersides of leaves and along the stems. They suck sap from the plant, causing yellowing, stunted growth, and a sticky residue. Remove mealybugs manually with a cotton swab dipped in rubbing alcohol or use insecticidal soap.

Frequently Asked Question

How often should I water my Rex Begonia?

Water your Rex Begonia when the top inch of soil feels dry. It’s important to avoid overwatering, as it can lead to root rot. Ensure the pot has good drainage to allow excess water to escape.

What kind of light does a Rex Begonia need?

Rex Begonias prefer bright, indirect light. Place them near east or west-facing windows where they can receive filtered sunlight. Avoid direct sunlight, as it can scorch their delicate leaves.

How do I increase humidity for my Rex Begonia?

Rex Begonias thrive in high humidity environments. You can increase humidity by misting the leaves regularly, placing a tray filled with water and pebbles beneath the pot, or using a humidifier.

Should I fertilize my Rex Begonia?

Yes, regular fertilization is beneficial for Rex Begonias. Feed them with a balanced liquid fertilizer diluted to half-strength once a month during the growing season (spring and summer). Reduce or stop fertilization during the dormant period (fall and winter).

Can I propagate my Rex Begonia?

Yes, Rex Begonias can be easily propagated through leaf cuttings. Take a healthy leaf with a section of stem attached, place it in water until roots develop, then transfer it to a pot with well-draining soil.

How do I prevent leggy growth in my Rex Begonia?

Leggy growth occurs when the plant stretches for light. To prevent this, ensure your Rex Begonia receives adequate bright, indirect light. Rotate the plant occasionally to promote even growth.

Are there any specific temperature requirements for Rex Begonias?

Rex Begonias prefer warm temperatures between 65-75°F (18-24°C). They are sensitive to cold drafts, so avoid placing them in areas with fluctuating temperatures.

Conclusion

Rex Begonias are remarkable houseplants that captivate with their stunning foliage and vibrant colors. Their unique leaf patterns and textures make them a popular choice among plant enthusiasts. With the right care and attention, you can enjoy the beauty of Rex Begonias in your indoor spaces.

By providing bright, indirect light, maintaining appropriate humidity levels, and watering the plants correctly, you can create a favorable environment for Rex Begonias to thrive. Avoiding direct sunlight and fluctuations in temperature is crucial to prevent damage to their delicate leaves. Regular fertilization during the growing season can further promote healthy growth.

Propagation of Rex Begonias can be done through leaf cuttings, allowing you to expand your collection and share the beauty of these plants with others. While Rex Begonias are generally resistant to diseases and pests, it’s important to monitor them regularly for any signs of issues. Prompt action can help prevent the spread and minimize damage.


Mary Lloyster

Mary Lloyster

Mary, the ultimate oracle of indoor gardening! With years of experience and a flourishing indoor expo, Mary has become our go-to expert for all things related to house plants and indoor gardening. Despite her background in Political Science, Mary has discovered a delightful way to blend her full-time job with a touch of relaxation through indoor gardening. Now, she eagerly shares her wisdom and experiences with our readers on a daily basis. If you have any inquiries about house plants, indoor gardening techniques, or caring tips, don't hesitate to leave a comment for Mary in the designated section below!

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