Christmas moss is the moss people choose when Java moss looks too shaggy. Tropica sells it as Vesicularia montagnei ‘Christmas Moss’, rates it medium for light and difficulty and low for CO2, and puts it at 1 to 3 cm tall. It is slower and fussier than Java moss.
Why it looks like a fir branch
The name comes from the shape. Tropica describes its side branch structure as what distinguishes it from ordinary Vesicularia dubyana, and says it looks like fir tree branches. That regular, layered growth is why it reads as deliberate on a branch where Java moss reads as a green tangle.
More demanding than Java moss
Tropica is direct about this: it is more demanding than ordinary Java moss and grows more slowly. That shows in the ratings, where Java moss is easy with a low light demand and Christmas moss is medium for both.
What it needs
| Requirement | Christmas moss |
|---|---|
| Light demand | Medium |
| CO2 demand | Low |
| Difficulty | Medium |
| Growth rate | Medium |
| Placement | Moss, attach to wood or rock |
Attaching and trimming it
Tropica says it attaches readily to roots and stones, so tie or glue a thin layer onto the surface you want covered and let it take hold. The branching structure of spider wood suits it, and so do the crevices in dragon stone.
Then keep cutting. Tropica says that as it spreads in the water it needs pruning to keep its shape attractive, which is the same rule that keeps any moss from shading out its own base.
Christmas moss questions
Christmas moss or Java moss?
Java moss to start with. Tropica rates it easy with a low light demand, while Christmas moss is medium for both and grows more slowly. Christmas moss is the better-looking one once you can keep it.
Does Christmas moss need CO2?
No. Tropica rates its CO2 demand as low. Its light demand is medium, which is the rating that separates it from Java moss.
How do you attach Christmas moss?
Spread a thin layer over wood or rock and hold it there with cotton thread, fishing line or gel glue until it grips. Tropica says it attaches readily to roots and stones.
Sources: Tropica, Vesicularia montagnei ‘Christmas Moss’; Tropica, Taxiphyllum barbieri (Java moss).