Kalanchoe sexangularis, also known as Six-Angled Kalanchoe, is a distinctive succulent. This plant features fleshy, elliptical leaves that can range in color from green to a deep ruby-red. Its stems possess a six-angled structure, contributing to its common name. Originating from Southern Africa, including Zimbabwe, South Africa, and Mozambique, this species typically reaches up to three feet in height.
Caring for Six Angled Kalanchoe
Light Needs
Six-Angled Kalanchoe thrives with bright, indirect light. Placing the plant near a window that receives morning sunlight or filtered light is suitable for indoor cultivation. While it can tolerate lower light, this may result in greener foliage, as sufficient light enhances its vibrant reddish hues. Direct sunlight, especially during the hottest parts of the day, can cause sunburn or discoloration. For outdoor settings, partial shade prevents scorching.
Watering Practices
Proper watering for Six-Angled Kalanchoe follows the “soak and dry” method. Thoroughly water the plant until water drains from the bottom, then allow the soil to dry out completely before the next watering. Overwatering is a frequent issue, leading to root rot and mushy, yellow, or translucent leaves. Watering frequency depends on season, pot size, and humidity, but generally occurs every two to three weeks. During winter dormancy, the plant requires significantly less water.
Soil Requirements
A well-draining soil mix is essential for Six-Angled Kalanchoe, as its succulent nature makes it vulnerable to root rot in overly moist conditions. A cactus or succulent potting mix is ideal. To enhance drainage and aeration, add materials such as perlite, coarse sand, or pumice to the soil. Clay pots also promote better air circulation around the roots.
Temperature and Humidity
Six-Angled Kalanchoe thrives in warm environments, with ideal indoor temperatures between 60°F and 80°F (15-27°C). It is sensitive to frost and should be protected from temperatures below 50°F (10°C), as colder conditions can cause damage. It is not cold hardy and requires protection in freezing climates. The plant tolerates typical indoor humidity levels, generally between 30% and 50%. Excessive humidity can contribute to fungal diseases or root rot, so good air circulation is beneficial.
Fertilizing
Six-Angled Kalanchoe does not require heavy fertilization. During its active growing season (spring to early fall), apply a diluted, balanced liquid fertilizer formulated for succulents and cacti. Fertilizing every four to six weeks is sufficient. Avoid fertilizing during winter dormancy. Always water the plant thoroughly before applying fertilizer to prevent root burn.
Propagating Six Angled Kalanchoe
Six-Angled Kalanchoe can be propagated using stem or leaf cuttings. Stem cuttings are often the easiest method.
To propagate via stem cuttings, select a healthy stem approximately four to six inches long and remove the lower leaves. Allow the cut end to dry and form a callus for a few days to prevent rot. Once callused, insert the cutting into a well-draining succulent soil mix. Keep the soil lightly moist until roots develop. Place the newly planted cutting in bright, indirect light or partial shade during this rooting period.
Leaf cuttings also offer a viable propagation method. Choose a mature, healthy leaf and gently twist it from the main plant. Similar to stem cuttings, allow the leaf to callus for several days before placing it on the surface of well-draining succulent soil. Keep the soil lightly moist, and small plantlets will emerge. Once developed, they can be separated and transplanted into their own pots.
Addressing Common Problems
Overwatering is a common issue for Six-Angled Kalanchoe, causing root rot and soft, mushy, yellow, or translucent leaves. To address this, reduce watering immediately, ensure proper pot drainage, and if severe, remove the plant to inspect and trim any rotted roots before repotting in fresh, dry soil.
Leggy growth results from insufficient light as the plant stretches. Move the plant to a brighter location or supplement with grow lights. Pruning leggy stems can also help maintain a compact shape and encourage bushier growth.
Pest infestations can affect Six-Angled Kalanchoe, with common culprits including mealybugs, scale insects, spider mites, aphids, snails, and slugs. Signs of pests include sticky residue, white cotton-like spots, or fine webbing on the foliage. Treatment options include applying insecticidal soap or neem oil.
Sunburn, characterized by brown or crispy leaf edges, occurs from excessive direct sunlight and is remedied by moving the plant to a shadier spot.
Safety Considerations
Six-Angled Kalanchoe is toxic to both humans and pets, including cats and dogs. The plant contains bufadienolides, which are particularly concentrated in the flowers. If ingested by pets, symptoms can include vomiting, diarrhea, excessive drooling, weakness, and changes in heart rate. In severe instances, ingestion can lead to cardiac arrest and be fatal. For humans, ingestion may cause nausea and vomiting. Due to these risks, keep Six-Angled Kalanchoe out of reach of children and animals.