Rhipsalis oblonga is a captivating species known as the Mistletoe Cactus. Unlike arid-dwelling cacti, this jungle cactus thrives as an epiphyte, growing on tree trunks and branches for support. Native to the humid Mata Atlântica (Atlantic Forest) of southeastern Brazil, it is found from sea level up to 2000 meters. This tropical origin explains its preference for dappled light and high humidity, making it a relatively undemanding houseplant popular for hanging baskets.
Identifying Features of Rhipsalis oblonga
The physical appearance of Rhipsalis oblonga is defined by its segmented, semi-erect to pendent stems, which can grow up to 2.5 meters in mature specimens. These stems are dimorphic, meaning the main branches are cylindrical at the base but quickly transition into the characteristic flattened, ribbon-like segments above. These ultimate segments are oblong in shape, typically measuring 8 to 15 centimeters long and up to 6 centimeters wide.
The stems display a bright olive-green or light green coloration and are slightly succulent, though not as thick as desert cacti. The plant lacks prominent spines; instead, the areoles, which are small bumps along the stems’ margins, are often woolly and may contain vestigial hairs or occasional small bristles. Small, yellowish-white flowers appear along the sides of the branches, followed by minute, globular to short-oblong fruits. These berry-like fruits are translucent and can range from nearly white to pale pinkish-white upon reaching maturity.
Creating the Ideal Habitat
As an epiphyte from a humid forest environment, Rhipsalis oblonga requires bright, indirect light. In its natural setting, light is filtered through the forest canopy, so the plant must be protected from harsh midday or afternoon sun, which can cause scorching or turn the stems yellow. Positioning the plant in an east- or west-facing window is often ideal, or a south-facing window where the light is diffused by a sheer curtain.
The plant’s tropical origin dictates a consistent temperature range, ideally between 18 and 24 degrees Celsius (64–75 degrees Fahrenheit) throughout the year. While it can tolerate a slight drop in nighttime temperatures, it is not tolerant of frost and should be maintained above 10 degrees Celsius (50 degrees Fahrenheit) at all times. High air humidity, ranging from 50 to 70 percent, supports healthy growth. This can be achieved indoors with a humidifier or by placing the pot on a tray filled with pebbles and water.
The potting medium must reflect its epiphytic nature, requiring a mix that offers excellent drainage and aeration to prevent root rot. A standard cactus or succulent mix is often too dense and water-retentive for this species. A more suitable substrate can be created by blending standard potting soil with coarse materials like orchid bark and perlite in roughly equal parts. This highly porous mixture allows the shallow root system to anchor while preventing “wet feet.”
Routine Care and Reproduction
Rhipsalis oblonga is not drought-tolerant, requiring a regular watering schedule. During the active growing season of spring and summer, the plant should be watered thoroughly once the top few inches of the potting medium have dried out. It is advisable to use soft, lime-free water, such as filtered or rainwater, as these cacti can be sensitive to the mineral content in hard tap water.
Fertilization should be applied sparingly, as these are not heavy feeders. A balanced, water-soluble fertilizer, diluted to half or quarter strength, can be applied every two to four weeks during the spring and summer. It is best to discontinue feeding entirely during the winter months, and some growers stop fertilizing once flower buds begin to form.
Pruning can be performed in the early spring to manage the plant’s long, trailing habit, or to remove any damaged or excessively long shoots. The plant easily tolerates having its stems shortened to encourage a bushier growth habit. Propagation is achieved through simple stem cuttings taken during the growing season.
To propagate, select a healthy stem segment and use a clean, sharp blade to cut a piece 8 to 15 centimeters long. Allow the cut end to form a protective callous by letting the cutting sit in a dry, shaded place for one or two days. The calloused cutting can then be inserted about 3 to 4 centimeters deep into the same well-draining substrate used for the mature plant. Keep the medium lightly moist until rooting occurs, which usually takes several weeks.