Rhipsalis micrantha, often called Mistletoe Cactus, is a distinctive epiphytic cactus. Unlike its desert-dwelling relatives, this plant thrives in conditions that mimic its native rainforest habitat, making it a relatively straightforward plant to care for. Its cascading stems offer a trailing display.
Understanding Rhipsalis Micrantha
Rhipsalis micrantha originates from the humid forests of Central and South America, including regions in Costa Rica, Colombia, Ecuador, Peru, and Venezuela. As an epiphyte, it naturally grows on trees for support, not drawing nutrients from them directly. Its roots primarily serve for anchorage, absorbing moisture and nutrients from the air and decomposing organic matter.
This plant features slender, succulent, linear branches that can extend up to 1.5 meters in length. While it is a cactus, it lacks the prominent spines typically associated with desert cacti. Delicate, whitish flowers appear along the stems, usually between February and May, followed by small, globose, berry-like fruits that can be white or have a reddish tint.
Rhipsalis Micrantha Care Guide
Light
Rhipsalis micrantha thrives in bright, indirect light. Direct sunlight can scorch its delicate stems, leading to discoloration or damage. An east or north-facing window provides ideal light, or a location several feet away from a south-facing window where light is filtered through a sheer curtain. If natural light is limited, supplemental grow lights can support healthy growth.
Watering
Water Rhipsalis micrantha thoroughly when the top 1-2 inches of soil feel dry to the touch. Ensure the pot has adequate drainage to prevent waterlogging and root rot. While it prefers consistent moisture, allowing the soil to dry slightly between waterings is crucial, as it does not tolerate constantly wet conditions.
Soil
A well-draining, airy potting mix is crucial for Rhipsalis micrantha due to its epiphytic nature. A suitable mix allows for good aeration and moisture retention. Components like orchid bark, perlite, and peat moss or coco coir are recommended. A blend of regular potting soil with added perlite and orchid bark also works.
Temperature and Humidity
Rhipsalis micrantha prefers consistent temperatures ranging from 15-24°C (60-75°F). Protect it from sudden temperature fluctuations and cold drafts. This plant appreciates moderate to high humidity levels, ideally around 50-60%. If indoor air is dry, increasing humidity with a humidifier or a humidity tray can help.
Fertilization
Rhipsalis micrantha is not a heavy feeder. During its active growing season in spring and summer, apply a balanced, diluted liquid fertilizer monthly. A general houseplant fertilizer or one formulated for cacti, diluted to half strength, is suitable. Reduce or cease fertilization during the dormant winter months.
Propagating Rhipsalis Micrantha
Propagating Rhipsalis micrantha uses stem cuttings, ideally taken during the growing season. Select healthy stems and cut segments approximately 10 centimeters (4 inches) long. Allow the severed ends to dry and form a callus for a few days to prevent rot.
Once calloused, insert the cuttings into a well-draining potting mix. The mix can consist of cactus soil, perlite, and orchid bark. Keep the soil lightly moist but not soggy, and place the pot in an area with bright, indirect light. Roots begin to form within a few weeks, followed by new growth.
Troubleshooting Common Issues
Rhipsalis micrantha can experience issues from improper care. Limp or shriveled stems indicate underwatering. Yellowing or dropping stems signal overwatering, which can lead to root rot if drainage is insufficient. Checking soil moisture before watering prevents both extremes.
Common pests affecting Rhipsalis micrantha include spider mites, mealybugs, and scale insects. Regularly inspecting the plant, especially in stem crevices and undersides, helps in early detection. If pests are found, they can be treated by wiping them away with a cotton swab dipped in 70% isopropyl alcohol or by using insecticidal soap. Maintaining optimal growing conditions helps the plant’s natural defenses.