Christmas moss
Vesicularia montagnei
Also known asXmas moss · Christmas tree moss
Water parameters
Light and nutrients
Substrate type: epiphyte. Propagation: fragmentation.
Substrate compatibility
| Substrate | pH effect | Nutrient load |
|---|---|---|
| Wood and rock mounts (Hardscape mount) | varies | none |
| Bare bottom (no substrate) (Bare bottom) | n/a | none |
| Inert sand (Pool filter sand) | neutral / inert | none |
| Inert gravel (Aquarium gravel) | neutral / inert | none |
| Aquasoil (ADA Amazonia) | lowers pH | very high |
| Mineralized clay substrate (Seachem Fluorite) | neutral / inert | moderate |
With fish
Origin and habitat
An aquatic moss of the family Hypnaceae, Vesicularia montagnei, widely distributed across temperate, subtropical and tropical Asia, from China and Japan through India, Sri Lanka, Thailand, Vietnam, Indonesia and the Philippines, and also recorded in Australia and Africa, growing in damp places on rocks and tree trunks near streams. In aquascaping it is prized for the triangular, layered branching of its fronds, which resemble tiny Christmas trees and give it its name, a denser and more orderly look than the loose growth of Java moss, Taxiphyllum barbieri. The exact identity of the aquarium plant is debated, but it is sold as V. montagnei. It is used to clothe driftwood, stone and mesh with naturalistic carpets and has been a staple of Nature Aquarium-style aquascaping since the early 2000s.
Outdoor pond use
- USDA zones
- 7–13 (winter low around -18°C or warmer)
Care notes
Attach it to driftwood, stone or stainless mesh with a dab of aquarium glue or by wrapping it in thread until its rhizoids grip over a few weeks. Low to moderate light brings out the tight triangular fronds, while strong light tends to elongate the growth and lose the shape and also invites algae, so moderate light usually looks best. CO2 is not needed but speeds and thickens growth. Trim with scissors every month or two to keep the shape and stop the mat getting so thick that the shaded interior dies, and the clippings can be reattached elsewhere to spread it. Growth is moderate, slower than Java moss but faster than Bucephalandra. It is one of the best plants for shrimp tanks: the dense fronds hold biofilm that shrimp graze, shelter shrimplets and fry, and trap fine food, so a moss-covered piece of wood in a cherry-shrimp tank works as a self-renewing food and cover system. Maintenance is mostly the occasional trim and waving a hand through it to free trapped detritus. It is undemanding about water chemistry and reasonably cold-tolerant across about 18°C to 28°C. Next to Java moss it looks more refined and layered but grows a touch slower and wants a little more light. It is an ornamental aquatic moss, not a crop, so it is unsuited to media-bed aquaponics or hydroponics.