The Black Cherry Rex Begonia (Begonia rex-cultorum ‘Black Cherry’) is a striking houseplant prized for its dramatic foliage. With deep burgundy, near-black leaves adorned with silver or purple accents, this begonia adds a bold, elegant touch to indoor gardens. Though it requires specific care, it rewards with stunning growth when given the right conditions. Below is a detailed guide to help you successfully grow and maintain your Black Cherry Rex Begonia.

1. Understanding Black Cherry Rex Begonia

Before diving into its care, let’s explore its key characteristics:

• Botanical Name: Begonia rex-cultorum ‘Black Cherry’
• Common Name: Black Cherry Rex Begonia
• Plant Type: Rhizomatous perennial
• Mature Size: 12-18 inches tall, 16-24 inches wide
• Growth Habit: Compact, mounding
• Sun Requirements: Bright, indirect light
• Soil Type: Light, well-draining, peat-based mix
• Watering Needs: Moderate; allow soil to dry slightly between waterings
• Humidity Preference: High humidity (50-70%)
• Hardiness Zones: USDA zones 10-11 (grown indoors in most climates)
• Toxicity: Mildly toxic to pets and humans if ingested

2. Light Requirements

Proper lighting is essential for maintaining the vibrant colors of Black Cherry Rex Begonia.

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• Prefers bright, indirect light; direct sunlight can scorch leaves.
• Can tolerate low light, but colors may fade and growth may slow.
• If grown indoors, place near an east- or north-facing window for optimal light.
• Consider using a grow light if natural light is insufficient.

3. Soil and Potting Requirements

• Use a light, well-draining soil mix that retains some moisture but does not stay soggy.
• A good mix includes:
  • Peat moss or coco coir (for moisture retention)
  • Perlite or pumice (for aeration)
  • Compost or worm castings (for nutrients)
• Ensure the pot has drainage holes to prevent waterlogging.
• Rex Begonias prefer being slightly root-bound, so repot only when necessary (every 2-3 years).

4. Watering Requirements

Watering is crucial for keeping your Black Cherry Rex Begonia healthy.

• Water when the top inch of soil feels dry. Stick your finger into the soil to check moisture levels.
• Use room-temperature, filtered water to prevent shock and avoid chemicals like chlorine.
• Avoid overwatering, which leads to root rot, one of the biggest threats to Begonias.
• Water at the base of the plant, avoiding the leaves, as wet foliage increases the risk of fungal infections.
• Reduce watering frequency in winter when growth slows.

5. Humidity and Temperature

• Requires high humidity (50-70%) for optimal growth.
• If indoor air is dry, use a humidifier, pebble tray, or mist the air around the plant (avoid misting directly on leaves).
• Prefers temperatures between 60-75°F (16-24°C).
• Avoid exposing to drafts, sudden temperature drops, or heating vents.

6. Fertilizing for Healthy Growth

• Feed with a balanced liquid fertilizer (10-10-10 or 20-20-20) diluted to half strength every 2-4 weeks during the growing season (spring and summer).
• Reduce feeding to once every 6-8 weeks in fall and winter.
• Avoid over-fertilizing, as excess nutrients can cause leaf burn and weak growth.
• Organic alternatives like worm castings or compost tea can also provide nutrients.

7. Pruning and Maintenance

• Remove yellow, damaged, or dead leaves regularly to encourage new growth and improve air circulation.
• If the plant becomes leggy, pinch back stems to promote a fuller, bushier shape.
• Keep the plant clean by gently wiping leaves with a damp cloth to remove dust.

8. Propagation Methods

You can easily propagate Black Cherry Rex Begonia through leaf cuttings or division.

A. Leaf Cuttings (Best Method)

1. Select a healthy, mature leaf.
2. Cut the leaf into sections, ensuring each piece has a vein.
3. Press the cuttings into moist potting mix with the veins facing down.
4. Cover with plastic wrap or place in a propagation tray to retain humidity.
5. Keep in bright, indirect light and mist occasionally.
6. New plantlets should appear in 4-6 weeks.

B. Division

1. Remove the plant from the pot.
2. Carefully separate the rhizomes into smaller sections, each with roots.
3. Repot into fresh soil and water lightly.

9. Common Pests and Diseases

Black Cherry Rex Begonia is susceptible to a few pests and diseases.

A. Common Pests

• Spider Mites: Causes yellowing and webbing; treat with neem oil or insecticidal soap.
• Mealybugs: White cotton-like spots on stems and leaves; remove with alcohol-soaked cotton swabs.
• Fungus Gnats: Indicate overwatering; allow soil to dry slightly and use sticky traps.

B. Common Diseases

• Powdery Mildew: White, powdery fungal growth on leaves; improve air circulation and avoid overhead watering.
• Root Rot: Caused by overwatering or poor drainage; repot in fresh soil and trim affected roots.
• Botrytis (Gray Mold): Causes leaf decay; remove affected leaves and improve air circulation.

10. Overwintering Black Cherry Rex Begonia

• Growth slows in winter, so reduce watering and fertilization.
• Maintain indoor temperatures above 60°F (16°C).
• Keep humidity levels steady and avoid cold drafts.
• If leaves die back, trim them and wait for regrowth in spring.

11. Companion Planting

Black Cherry Rex Begonia pairs well with other shade-loving, high-humidity plants:

• Calatheas: Similar humidity requirements and vibrant foliage.
• Ferns: Create a lush, tropical effect.
• Orchids: Complement with their elegant blooms.
• Peace Lilies: Share similar care requirements.

Final Thoughts

Black Cherry Rex Begonia is a captivating plant that thrives with proper care. By providing bright indirect light, well-draining soil, consistent humidity, and careful watering, you’ll enjoy its stunning foliage for years to come. Whether you’re a seasoned plant collector or a beginner, this unique begonia is an excellent addition to your indoor garden. Happy growing!