Exotica Begonia

Basic Information

Common Name: Exotica Begonia

Scientific Name: Begonia brevirimosa exotica

Native Habitat: New Guinea

History / Discovery / Cultivator

Begonia brevirimosa exotica, commonly known as the Exotica Begonia, originates from the lush rainforests of New Guinea. The Begonia brevirimosa species itself was first described scientifically, though information regarding its exact discovery date and the botanist who formally identified it is somewhat elusive in easily accessible records. The “exotica” cultivar, however, is recognized for its enhanced ornamental appeal.

The exact history of the ‘Exotica’ cultivar’s development and introduction to horticulture is difficult to definitively pinpoint through readily available literature. It’s likely that the ‘Exotica’ variant was selected from naturally occurring variations within the Begonia brevirimosa population or through deliberate hybridization efforts by plant collectors or nurseries in the latter half of the 20th century or early 21st century. New Guinea, being a biodiversity hotspot, provides ample opportunity for such natural variations to emerge.

The popularity of Begonia brevirimosa exotica stems from its striking foliage. Unlike many begonias prized for their flowers, this plant is celebrated for its large, deeply lobed leaves that showcase a vibrant contrast between the dark green upper surface and the intense red underside. The ‘Exotica’ epithet clearly alludes to its exotic and visually arresting appearance, which distinguishes it from more common begonia varieties. This unique aesthetic has made it a sought-after specimen among plant enthusiasts and collectors.

While specific information regarding early cultivators may be lacking, various nurseries and botanical gardens specializing in rare and unusual plants have played a crucial role in propagating and distributing Begonia brevirimosa exotica. These institutions contribute significantly to making such unique plants available to the wider horticultural community, enabling plant lovers to cultivate and appreciate this New Guinea treasure. The internet and social media have also contributed to the popularity and increased availability of this begonia. Plant collectors often trade cuttings and plants through online communities, fostering a greater appreciation and demand for unusual species.

Begonia brevirimosa exotica presents a captivating blend of botanical intrigue and horticultural appeal. Its vibrant foliage and relative ease of care, compared to some other exotic begonias, contribute to its rising popularity. While its exact origins may remain somewhat shrouded in the mists of horticultural history, its continued presence in plant collections around the world solidifies its position as a captivating and desirable species.

Plant Care Summary

Botanical Insights

Adaptations

Begonia brevirimosa exotica’s adaptations are primarily geared towards thriving in the humid, dimly lit understory of New Guinea’s rainforests. Its large, broad leaves are designed to capture as much available light as possible in the shaded environment. The red undersides of the leaves may serve to reflect light back into the leaf for increased photosynthetic efficiency. High humidity tolerance is critical, preventing excessive transpiration in its moist native habitat. The plant’s sensitivity to direct sunlight indicates it is adapted to filtered light conditions. As a houseplant, providing consistent humidity and avoiding direct sun replicate these adaptations to support its growth and vigor.

Propagation Methods

Begonia brevirimosa exotica can be successfully propagated through several methods:

• Stem Cuttings: This is a common and effective method. Take a stem cutting with at least one node and place it in water or directly into moist, well-draining potting mix. Roots will typically develop within a few weeks.
• Leaf Cuttings: Portions of a leaf, including a vein, can be placed on moist potting mix or sphagnum moss to generate new plantlets.
• Division: Mature plants can be carefully divided at the root ball, ensuring each division has sufficient roots and foliage. This method is best done in spring.

Toxicology

Begonia brevirimosa exotica, like many begonias, contains soluble calcium oxalates. If ingested by humans, especially children, it can cause immediate pain and irritation in the mouth and throat. Symptoms may include excessive salivation, difficulty swallowing, and a burning sensation. Ingestion by pets, such as cats and dogs, can lead to similar symptoms, including drooling, vomiting, and oral discomfort. In severe cases, calcium oxalate crystals can cause kidney damage. It is recommended to keep this plant out of reach of children and pets. Contact a medical professional or veterinarian immediately if ingestion is suspected.

Common Problems

Pests:

• Mealybugs
• Spider mites
• Aphids

Diseases:

• Powdery mildew
• Root rot
• Botrytis blight (Grey mold)

Other:

• Leaf yellowing: Overwatering or underwatering
• Browning leaf tips: Low humidity or inconsistent watering
• Leggy growth: Insufficient light

Rarity & Value

Rarity:

Begonia brevirimosa exotica is considered somewhat uncommon but not exceedingly rare. Its limited natural habitat in New Guinea contributes to its relative scarcity. It’s not as widely propagated as more common begonia species, which also contributes to its less frequent appearance in plant shops. The specific “Exotica” cultivar, due to its desirable traits, might be slightly harder to find than the straight Begonia brevirimosa species.

Value:

The value of a Begonia brevirimosa exotica specimen is primarily influenced by its size, the vibrancy and intensity of the red coloration on the leaf undersides, and the overall health and vigor of the plant. Larger, well-established plants with richly colored leaves typically command higher prices. Plants free from pests and diseases are, of course, more valuable. Collector trends also play a role; if there’s a surge in demand for exotic foliage plants, the value can increase. Provenance (e.g., if it comes from a reputable grower or has a documented history) can also add to its value for serious collectors.