Trailing Begonia

Basic Information

Common Name: Trailing Begonia

Scientific Name: Begonia convolvulacea

Native Habitat: Bolivia and Argentina

History / Discovery / Cultivator

Begonia convolvulacea, commonly known as the Trailing Begonia, hails from the cloud forests of Bolivia and Argentina. Its discovery is less precisely documented compared to some other Begonia species, often found in the mid to late 19th century, coinciding with increased botanical exploration in South America. The plant was likely identified and collected by botanists exploring the Andean regions, where it clings to rocks and trees in humid environments. While the exact individual who first formally described and named Begonia convolvulacea remains somewhat obscure in popular records, the genus Begonia itself was named by Charles Plumier in honor of Michel Bégon, a French official who sponsored botanical expeditions.

The initial cultivation of Begonia convolvulacea likely occurred in European botanical gardens and private collections soon after its introduction. These institutions played a crucial role in propagating and studying new plant species from around the world. Early cultivators would have focused on replicating the plant’s native conditions – high humidity, dappled shade, and well-draining soil. The plant’s trailing habit and attractive foliage made it a desirable addition to collections of exotic flora.

Over time, Begonia convolvulacea has gained popularity among houseplant enthusiasts, valued for its unique appearance and relatively easy care requirements. Unlike some of its more demanding relatives, the Trailing Begonia adapts well to indoor environments, making it accessible to a wider range of growers. Its appeal lies in its delicate, trailing stems, adorned with small, rounded leaves that resemble those of a convolvulus (hence the name “convolvulacea”). The plant’s small white or pink flowers, while not as showy as some other begonias, add to its overall charm.

Modern cultivation of Begonia convolvulacea benefits from a better understanding of its needs. Growers now utilize specialized potting mixes, controlled environments, and improved propagation techniques to ensure healthy growth and flowering. It is also being increasingly appreciated by hobbyists focused on terrarium planting. Its modest size and humidity tolerance make it an ideal plant for enclosed environments. It remains a sought-after species by begonia collectors due to its distinct look compared to other more common species. The plant is also being used in breeding programs in the pursuit of new and improved trailing hybrids.

Plant Care Summary

Botanical Insights

Adaptations

Begonia convolvulacea exhibits several adaptations suited to its cloud forest environment. Its trailing growth habit allows it to cascade down rocks and trees, maximizing its access to sunlight in the shaded understory. The small, rounded leaves help reduce water loss through transpiration, an important adaptation in environments with fluctuating humidity levels. Furthermore, its tolerance for high humidity enables it to thrive in the moist conditions of cloud forests. The plant’s ability to propagate readily from stem cuttings is also advantageous, allowing it to quickly colonize new areas. This growth strategy, along with the epiphytic tendency the plant sometimes displays, helps it quickly access available nutrients within the humid environment.

Propagation Methods

Begonia convolvulacea is most commonly propagated through stem cuttings. Take 4-6 inch cuttings from healthy stems, removing the lower leaves. Root these cuttings in water or directly in a moist, well-draining potting mix. Another method is through leaf cuttings, where a leaf (or section of a leaf) is placed on moist soil with the cut edges making contact. These can then root, given enough time and the right conditions. The plant can also be propagated from seeds, though this method is less common due to the longer time it takes to produce a mature plant. Layering is another less common propagation method that can be employed.

Toxicology

Begonia convolvulacea contains soluble oxalates, which are mildly toxic to both humans and pets, especially cats and dogs. If ingested, these oxalates can cause oral irritation, including burning sensations in the mouth, excessive drooling, and difficulty swallowing. In rare cases, more severe symptoms such as vomiting and diarrhea may occur. The severity of the reaction depends on the amount ingested and the individual’s sensitivity to oxalates. Keep this plant out of reach of small children and pets to prevent accidental ingestion. If ingestion is suspected, contact a medical professional or veterinarian for advice.

Common Problems

Pests:

• Mealybugs
• Spider mites
• Aphids

Diseases:

• Powdery mildew
• Root rot
• Botrytis blight

Other:

• Leaf yellowing: Can be caused by overwatering, underwatering, nutrient deficiency, or insufficient light.
• Leggy growth: Often due to insufficient light, leading to elongated stems and sparse foliage.
• Brown leaf tips: Typically caused by low humidity or inconsistent watering.

Rarity & Value

Rarity:

While not exceptionally rare, Begonia convolvulacea is less commonly found than more mainstream begonia varieties. Its relatively slow growth and the need for specific humidity levels contribute to its scarcity in some regions. Propagation can also be tricky for novice gardeners, which makes finding established mature specimens a little harder than other plants in the begonia genus. Its cloud forest origin and lack of tolerance for dry air have kept it a more niche plant than easier cultivars.

Value:

The value of Begonia convolvulacea is influenced by several factors. Larger, well-established plants with healthy, trailing growth command higher prices. The overall health and appearance of the plant are crucial, with specimens free from pests and diseases being more valuable. Mature plants that are flowering are more valuable than non-flowering specimens. Rarity can influence value, so any unusual or variegated forms of B. convolvulacea would likely be sought after by collectors.