Cabomba
Cabomba caroliniana
Also known asgreen cabomba · fanwort
Water parameters
Light and nutrients
Substrate type: nutrient preferred. Propagation: cuttings.
Substrate compatibility
| Substrate | pH effect | Nutrient load |
|---|---|---|
| Aquasoil (ADA Amazonia) | lowers pH | very high |
| Mineralized clay substrate (Seachem Fluorite) | neutral / inert | moderate |
| Dirted tank (mineralized topsoil) (DIY soil substrate) | slightly acidic | very high |
| Inert sand (Pool filter sand) | neutral / inert | none |
| Inert gravel (Aquarium gravel) | neutral / inert | none |
With fish
Origin and habitat
Native to slow-moving freshwater across the Americas, from the southeastern United States through Central America to South America. The genus Cabomba includes several species (C. caroliniana, C. aquatica, C. furcata) with similar fan-shaped, finely divided submerged leaves that create a feathery, intricate texture. The most common species in the aquarium trade is C. caroliniana (green cabomba). The plant grows as long, soft stems with whorls of fan-shaped leaves at each node. In the wild, it forms dense underwater meadows in ponds, slow rivers, and lake margins. Cabomba is widely available and inexpensive but has a reputation among experienced hobbyists as a plant that looks great at purchase and then deteriorates in many home tanks.
Outdoor pond use
- USDA zones
- 5–11 (winter low around -29°C or warmer)
Care notes
The reputation for difficulty is partly deserved: Cabomba needs more light than many beginners expect. Under low light, the fine leaves at the bottom of the stem die, the plant becomes leggy and bare, and it eventually disintegrates. Medium to high light (50+ PAR at the plant) keeps it healthy. CO2 injection significantly improves growth and prevents the lower-stem dieback that frustrates keepers. In a high-tech setup with CO2 and good light, Cabomba grows fast and looks spectacular, with dense, feathery growth that sways in current. Without CO2, it can still work under strong light, but growth is slower and the plant requires more attention. Soft to moderately hard water is preferred (GH 3-12); very hard water causes the fine leaves to develop calcium deposits. Plant stems in groups, pushed into the substrate. The fine leaves trap detritus, so gentle water circulation around the plant helps keep it clean. Trim tops and replant to propagate. The cut lower stems may or may not regrow; Cabomba is less reliable at producing side shoots than most stem plants. Because of the moderate difficulty and detritus-trapping tendency, many experienced aquascapers skip Cabomba in favor of easier feathery alternatives like Myriophyllum or Limnophila. But for keepers with adequate light and CO2, it's one of the most beautiful background plants available.