Pfeiffera monacantha

Natural range and habitat of Pfeiffera monacantha

Pfeiffera monacantha occurs naturally from Bolivia into north-western Argentina. It occurs in east-Andean valleys and Yungas environments, growing on trees and on rock.

The roots settle into shallow pockets of organic material on trunks, branches and rocky surfaces. The stems hang away from these attachment points and extend through the surrounding vegetation.

Growing Pfeiffera monacantha

• Light: Give it bright filtered or indirect light. Introduce gentle direct sun gradually.
• Temperature: Keep temperatures around 16–24 °C. Avoid prolonged temperatures below 10 °C. Keep it warm and frost-free.
• Humidity: Aim for 50–60% humidity. Keep humidity moderate to high, with regular airflow around the crown and hanging branches.
• Water: Water thoroughly as new branches grow, then let the airy epiphytic mix become partly dry before watering again. When growth pauses, wait until the mix is mostly dry before watering again.
• Potting mix: Use a coarse, airy epiphytic cactus mix that drains quickly and stays loose around the roots.
• Feeding: Use a balanced liquid fertiliser a few times while new branches are forming, then pause feeding when growth stops.
• Support: Give the stems room to trail from a hanging container or shelf.
• Repotting: Repot when the roots fill the container or the mix compacts and stays wet after watering.
• Propagation: New plants can be raised from seed or rooted stem sections.

Common problems with Pfeiffera monacantha

• White cottony insects in areoles: mealybugs may hide along the stem margins. Isolate an active infestation, remove visible insects, and use a product labelled for mealybugs on ornamental plants at the stated dose and repeat interval.
• Persistent wrinkling after watering: roots may be extremely dry or damaged after staying wet for too long. Check the roots. If the roots are firm and dry, water thoroughly. If they are soft or rotten, cut away all rotten tissue to firm healthy tissue with a clean tool, discard the rot, and repot the remaining healthy rooted plant in fresh, fast-draining mix.
• Soft brown or black stem bases: dense wet mix can damage the roots and allow rot to enter the stems. Cut away all affected tissue to firm healthy tissue with a clean tool, discard the rot, let the cut dry, then repot the remaining healthy rooted plant in fresh, fast-draining mix.
• Bleached dry marks on exposed branches: a sudden increase in direct sun can burn the stems. Return the plant to filtered light and increase direct sun gradually on new growth.

Keep Pfeiffera monacantha away from children and pets

• Keep this plant away from children, cats and dogs.
• Its effects after chewing or swallowing are unclear, and plant material can still cause an upset stomach.
• Contact a veterinarian or medical professional if symptoms develop or do not settle.

What does the name Pfeiffera monacantha mean?

Pfeiffera commemorates Ludwig Karl Georg Pfeiffer. Monacantha combines Greek monos, single, with akantha, spine or thorn, referring to the commonly solitary prominent spine.

Joseph Franz Maria Anton Hubert Ignatz Fürst zu Salm-Reifferscheid-Dyck established the genus Pfeiffera in 1845 in Cacteae in Horto Dyckensi Cultae, 1844, page 40.

August Heinrich Rudolf Grisebach first described it as Rhipsalis monacantha in 1879 in Abhandlungen der Königlichen Gesellschaft der Wissenschaften zu Göttingen, volume 24, page 140. Paul V. Heath later placed it in Pfeiffera as Pfeiffera monacantha in 1994 in Calyx, volume 4, page 158.