Scientific Name
Pfeiffera monacantha (Griseb.) P.V. Heath
Synonym(s)
Acanthorhipsalis monacantha, Hariota monacantha, Lepismium monacanthum, Pfeiffera monacantha subsp. monacantha, Rhipsalis monacantha
Scientific Classification
Family: Cactaceae
Subfamily: Cactoideae
Tribe: Rhipsalideae
Genus: Pfeiffera
Origin
Pfeiffera monacantha is native to northwestern Argentina and southeastern Bolivia. It grows as an epiphyte or lithophyte at elevations ranging from 980 to 6,560 feet (300 to 2,000 m).
Description
Pfeiffera monacantha, also known as Lepismium monacanthum or Rhipsalis monacantha, is a shrubby, slow-growing cactus with flat to three-angled branches with serrated ribs and felted areoles, each with a few bristles and 1 to 6 spines. The branches can grow up to 18 inches (45 cm) long and 1.2 inches (3 cm) wide, initially erect, becoming pendent as they grow. The spines are stout and black and can measure up to 0.4 inches (1 cm) long.
The flowers are waxy orange and appear solitary at areoles. They can reach up to 0.6 inches (1.5 cm) in length and 0.8 inches (2 cm) in diameter. The fruits are small, spherical, orange or pale pink, more or less translucent, and decorate the plant for months.
Hardiness
USDA hardiness zones 10a to 11b: from 30 °F (−1.1 °C) to 50 °F (+10 °C).
How to Grow and Care
Rhipsalis do not thrive in direct sunlight. Exposure to the afternoon sun can burn the leaves, turn them yellow, or lead to spotting. However, they will not bloom without sufficient sunlight, and their growth can be stunted. Therefore, these cacti do best with morning sun and full shade in the afternoon.
As Rhipsalis is commonly grown indoors, care must be given to the placement of the plants. They should be kept at least 20 inches (50 cm) from windows that receive midday or afternoon sun. The glass in the windows can multiply the heat from the sun's rays, causing sunburned leaves. Keep in mind that in its native environment, Rhipsalis is accustomed to receiving light filtered through dense, overhanging tree branches. Picturing this environment can help you adjust your lighting accordingly.
Rhipsalis is not a drought-resistant plant, so regular watering is essential. Overwatering, however, can cause weak stems and rotted roots. A watering can help you measure the amount of water you are providing. The pot size, compared to the size of the plant, the humidity levels in the home, and the type of potting soil used can all affect the watering frequency.
Learn more at How to Grow and Care for Rhipsalis.
Links
- Back to genus Pfeiffera
- Succupedia: Browse succulents by Scientific Name, Common Name, Genus, Family, USDA Hardiness Zone, Origin, or cacti by Genus
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