Light
Bright Indirect Light
Requires filtered or bright indirect light; direct sun can scorch the delicate segments.
Reference image Lepismium houlletianum
Snowflake Cactus
Overview
Lepismium houlletianum, commonly known as the 'snowflake cactus', is a highly attractive and distinct epiphytic cactus with weeping, flattened stems and delicate cream-colored flowers. Unlike typical desert cacti, this plant is adapted to moist, humid forest canopies, making it an exceptional trailing specimen for indoor hanging baskets 1.
Taxonomy and Naming
This species belongs to the tribe Rhipsalideae within the Cactaceae family. The specific epithet houlletianum honors the French horticulturist Jean-Baptiste Houllet. It has historically been classified under various genera, most notably as Rhipsalis houlletiana, with which it is still frequently synonymous in horticultural trade 1.
Distribution and Habitat
Lepismium houlletianum is native to South America, predominantly found in the Atlantic Forest region of southern and southeastern Brazil (including Rio de Janeiro, São Paulo, and Rio Grande do Sul) as well as northeastern Argentina. It thrives in humid, wet tropical biomes, growing as an epiphyte on trees or occasionally as a lithophyte on rocks 2.
Appearance
The plant features elongated, flat, leaf-like segments with deeply serrated or notched margins. These serrated segments distinguish it from many other Rhipsalideae. In late winter or early spring, tiny, bell-shaped, pale yellow to cream flowers dangle from the notches (areoles), which later develop into small, decorative reddish-purple berries.
Cultivation and Care
To mimic its natural habitat, it requires bright, indirect sunlight and high humidity. It should be grown in a porous, fast-draining potting medium rich in organic matter, such as an orchid or bromeliad mix 2. Watering should be consistent, allowing the top layer of soil to dry out between applications, without letting the roots sit in water.
Common Pitfalls
Treating this species like a desert cactus by letting it dry out completely for long periods is a common mistake. Conversely, heavy clay soil and poor drainage will quickly cause root rot. Inadequate air humidity may lead to withered margins.
Bibliography
References
Watering
6-14 Days
Water thoroughly once the topsoil dries; reduce frequency slightly in winter.
Soil
Aerate, humus-rich, perlite and orchid bark-based specialized epiphytic mix
An open, porous epiphytic mix with orchid bark, perlite, and organic peat.
Safety
Pet Friendly
Non-toxic to cats, dogs, and other household pets.
Difficulty
Easy
Easy to moderate; great for beginners who can avoid overwatering.
Native Habitat
Brazil, Argentina
Native to the humid Atlantic Forest of Brazil and parts of northeastern Argentina, where it lives perched on forest trees, receiving dappled sunlight and ample atmospheric moisture.
Frequently Asked Questions
Is Lepismium houlletianum a true cactus?
Yes, it is a true cactus belonging to the Cactaceae family, but it is an epiphytic cactus that grows on trees in rainforests, unlike desert cacti.
Is it toxic to pets?
No, *Lepismium houlletianum* is non-toxic and safe for both cats and dogs.
How often should I water it?
Water when the top inch of soil dries out, roughly every 5-7 days in summer. In winter, reduce watering to once every 10-14 days.
What kind of soil does it prefer?
It prefers airy and well-draining soil. A mix of peat-based cactus soil, perlite, and fine orchid bark is ideal for its epiphytic roots.
How do I get it to bloom?
To encourage blooming, give the plant a cooler rest period in autumn and winter (around 12-15°C) with reduced watering. Buds will form in early spring.
Why are the stems wrinkling?
Wrinkling is usually caused by severe underwatering or root rot due to overwatering, preventing the plant from absorbing water. Check the soil moisture.
Does it need direct sunlight?
No, direct harsh sunlight can bleach or burn the stems. Bright, filtered, or indirect light is best.
What is its growth rate?
With proper humidity, care, and indirect light, it has a moderate growth rate, with cascading stems growing 20-30 cm per year.
How do you propagate it?
It is easily propagated by stem cuttings. Let the cutting calloused for 2 days, then plant it in a moist, well-draining potting mix.
When should I repot it?
It does not need frequent repotting as it prefers being slightly root-bound. Repotting every 2-3 years in spring into a slightly larger pot is sufficient.