Pseudorhipsalis amazonica
| Light | Bright, indirect light; protect from direct midday sun |
|---|---|
| Water | Regular through the growing season; let the top of the mix dry between waterings, ease off in winter |
| Soil | Open, humus-rich epiphyte mix that never stays soggy (see Soil and potting mix) |
| Temperature | Warm and frost-free; USDA zones 10–11 |
| Propagation | Stem cuttings (primary); seed |
| Toxicity | Not specifically documented for this species; the superficially similar Rhipsalis, often used as a proxy, is listed as non-toxic to cats and dogs |
Pseudorhipsalis amazonica is a flat-stemmed, epiphytic jungle cactus grown for its unusual tubular flowers, which carry a carmine-red tube set off by contrasting blue, purple, or magenta bracts and open along the margins of its leaf-like stems. A native of humid tropical forest, it makes an easy, trailing basket plant that rewards warmth and steady moisture rather than the hard, dry treatment given to desert cacti. It belongs to the genus Pseudorhipsalis — the name means "false Rhipsalis" — a group of tropical epiphytes (tribe Hylocereeae) whose closest relatives are Epiphyllum and Disocactus; despite the resemblance that gives the genus its name, it is only distantly related to the true Rhipsalis.
Description
Pseudorhipsalis amazonica is a spineless epiphyte with long, pendent stems that are flattened and strap-like, resembling leaves; the leaf-like segments reach some 60 cm long and a few centimetres wide, while the older basal portions are more stalk-like and angled. The stem margins are shallowly scalloped or notched, and it is from the notches (the areoles) that both new growth and flowers arise. Older stems may become somewhat woody and rounded near the base while the actively growing tips stay soft and green.
The flowers are the plant's chief attraction: narrow and tubular, roughly 2.5–5 cm long, with a carmine-red tube and outer bracts of blue, purple, or magenta (the inner bracts paler — light blue, light magenta, or white). They open along the edges of the stems rather than at the tips. They are modest in size compared with the great nocturnal blooms of Epiphyllum, but their unusual two-toned colouring makes them stand out against the green stems. Small, scaly berry-like fruits may follow the flowers.
Distribution and habitat
Despite the epithet amazonica, the species is not confined to the Amazon. It ranges through the humid forests of southern Central America — Panama, where it is common, and Costa Rica, where it is rare — and along the eastern Andes and neighbouring lowlands of South America, in Colombia, Venezuela, Ecuador and Peru (where it is most abundant), extending into Brazil. It grows as an epiphyte perched on tree trunks and branches, where its roots sit in pockets of accumulated leaf litter and moss rather than in heavy ground soil, and the plant enjoys warmth, high humidity, and the dappled shade of the forest canopy. It is assessed as Least Concern on the IUCN Red List. Understanding these origins is the key to growing it well: it is a plant of moist, airy, shaded conditions, not baking sun and drought.
Cultivation
Grow Pseudorhipsalis amazonica much as you would a Rhipsalis or holiday cactus. It appreciates bright but filtered light; too much direct sun scorches and reddens the stems, while deep shade reduces flowering. A hanging basket or raised pot suits its trailing habit and lets the stems cascade.
Pot it in an open, moisture-retentive but fast-draining mix — a blend intended for epiphytes, with plenty of bark, coir, or leaf mould so that water drains freely yet the medium never bakes bone-dry. Water regularly while the plant is in growth, allowing the surface to dry between waterings, and reduce watering in the cooler, darker months without letting the stems shrivel. Keep it warm and frost-free year round, and maintain reasonable humidity; it dislikes cold, dry air. A light feed with a dilute balanced fertiliser during the growing season supports steady growth and bloom. See Watering and Repotting for general technique.
Propagation
The easiest method is by stem cuttings. Remove a healthy segment, let the cut surface callus for a day or two, then insert it into a moist, airy propagating mix; cuttings root readily in warm, humid conditions. The species can also be grown from seed sown on a warm, moist surface, though cuttings are faster and reproduce the parent exactly. See Propagation — cuttings and Propagation — seed for full walkthroughs.
Common problems
- Rot — the commonest cause of loss, from a waterlogged mix or standing water at the roots; use an open medium and never let the pot sit wet.
- Shrivelling — thin, wrinkled stems usually signal underwatering or very low humidity; this plant is less drought-tolerant than desert cacti.
- Scorch — stems that redden, bleach, or develop pale patches indicate too much direct sun; move to brighter shade.
- Pests — mealybugs (white fluff in the areoles) and scale are the usual offenders; watch also for spider mites in hot, dry air. See Pests and diseases.
See also
- Pseudorhipsalis — the genus overview
- Rhipsalis · Epiphyllum — related epiphytic jungle cacti
- Soil and potting mix · Watering · Repotting · Propagation — cuttings · Propagation — seed