Begonia lubbersii is a captivating plant known for its striking foliage and distinctive patterns. This cane-type begonia features unincised, silver-splashed green leaves, pointed at both ends with stems attached near the leaf’s middle. Native to the Atlantic Forest region of Brazil, it was discovered by and named for Belgian botanist Louis Lubbers.
Caring for Begonia lubbersii
Light
Begonia lubbersii thrives in bright, indirect light. An east or north-facing window is ideal, providing sufficient light without harsh direct sun exposure. Direct sunlight, especially intense afternoon sun, can scorch its delicate leaves, causing them to turn crispy or yellow. If direct sun is unavoidable, provide a sheer curtain or move the plant slightly away from the window for protection.
Watering
Consistent soil moisture is important for Begonia lubbersii, but avoid overwatering to prevent root rot. Water the plant thoroughly when the top inch or two of the soil feels dry to the touch. Ensure water saturates the root ball and drains from the pot’s bottom. Use tepid water to avoid shocking roots. During winter, when growth slows, reduce watering frequency.
Soil
A well-draining soil mix rich in organic matter is suitable for Begonia lubbersii. A peat-based compost or a mix designed for African Violets works well. Incorporating perlite or coarse sand into the potting mix enhances drainage and aeration. The ideal soil pH for begonias ranges between 5.5 and 6.5.
Temperature and Humidity
Begonia lubbersii prefers warm temperatures, ideally between 60°F and 75°F (15°C to 24°C). Protect it from cold weather, drafts, and sudden temperature changes. As a tropical plant, it requires moderate to high humidity, ideally around 50-60%. To increase humidity, consider placing the plant on a pebble tray filled with water, using a room humidifier, or lightly misting the leaves in the morning. Avoid water sitting on foliage to prevent fungal issues.
Fertilizing
During its active growing season in spring and summer, Begonia lubbersii benefits from regular fertilization. Apply a balanced liquid fertilizer, such as a 20-20-20 blend, diluted to half-strength, every two to four weeks. For young plants, a fertilizer with higher phosphorus can encourage root development. Reduce or stop fertilization in late October and resume in late February, allowing the plant to rest during cooler months.
Propagating Begonia lubbersii
Begonia lubbersii can be propagated using stem or leaf cuttings.
Stem Cuttings
For stem cuttings, select a healthy stem about 4-5 inches long with at least two nodes. Remove lower leaves to prevent submersion if rooting in water. The cut end can be dipped in rooting hormone, though optional.
Cuttings root in water or a moist potting medium. In water, place the cutting in a clean container with enough water to cover nodes, changing water periodically. For soil, insert the cutting into a well-draining mix like potting compost, perlite, and vermiculite. Maintain consistent moisture and high humidity by covering it with a clear plastic bag or humidity dome until roots develop, typically within a few weeks.
Leaf Cuttings
Leaf cuttings offer another propagation method. Choose a healthy, mature leaf and remove its stem. Make small slits along the main veins on the underside of the leaf. Lay the leaf flat, cut-side down, on a moist, fine propagating mix to ensure good contact with the medium. Covering the tray with a clear lid or plastic wrap helps maintain the high humidity needed for plantlets to emerge from the cut veins, which can take several weeks.
Addressing Common Issues
Several common issues can affect Begonia lubbersii, often stemming from environmental factors.
Yellowing leaves can indicate overwatering or insufficient drainage, potentially leading to root rot. If leaves turn yellow and feel mushy, allow the soil to dry out more between waterings. Conversely, crispy leaf edges or overall wilting may signal underwatering or low humidity. Ensuring consistent soil moisture and increasing ambient humidity can resolve this.
Stunted growth or bleached, washed-out leaves often point to incorrect light levels. Too much direct sun can cause leaves to look bleached, while too little light can lead to sparse, stretched growth. Adjusting the plant’s location to provide bright, indirect light typically improves these symptoms.
Leaf spots, appearing as brown or black patches, can be caused by fungal or bacterial issues. These are often exacerbated by water splashing on foliage or poor air circulation. Watering at the base of the plant and ensuring good airflow can help prevent these problems.
Pests like spider mites, aphids, and mealybugs can sometimes infest Begonia lubbersii. Spider mites cause tiny webs and stippling, while mealybugs appear as small, white, cotton-like masses, often found where leaves and stems branch. Aphids are small green or black insects found on the undersides of leaves. Isolate the affected plant and treat with insecticidal soap or neem oil to manage these infestations.
Powdery mildew, a white or gray fungal growth on leaves, is another common issue. It often occurs in high humidity with cool temperatures and poor air circulation. Improving air movement and, if necessary, applying a fungicide can address this.