Cabomba: the classic feathery bunch plant
Cabomba caroliniana
The fan-leaved bunch plant everyone recognises — and how to stop it dropping needles.
Where it comes from
Cabomba caroliniana is native to the warm, still and slow-moving waters of the Americas, from the southern United States down into South America. It is sometimes sold as green cabomba or fanwort to distinguish it from the far more demanding red and purple cabombas.
Like many fast aquarium plants it has escaped cultivation and is considered invasive in parts of Europe, Australia and Asia — so never release trimmings into the wild. Dispose of excess growth in the bin or compost.
What to expect
Each stem carries whorls of finely divided leaves that fan out like soft green feathers. Planted in a dense group it forms a light, billowing backdrop that contrasts beautifully with broad-leaved plants such as an Amazon sword or Anubias barteri.
Green cabomba is by far the easiest of the group. The red, purple and giant forms need bright light and CO2 to look anything like the shop photos and are best left until you have a stable, high-light tank.
How to keep it
Cabomba is the plant that teaches people light matters. In a bright tank it is lush and full; in a dim one the lower stems go bare and the fans shrink to spindly threads. Good light is non-negotiable, and pressurised CO2, while not essential, makes a dramatic difference.
| Parameter | Value |
|---|---|
| Lighting | Medium to high — thin and leggy in low light |
| CO2 | Not required but strongly beneficial |
| Temperature | 18–26 °C |
| pH | 6.0–7.5 |
| Hardness | Soft to moderate (2–12 °dH) |
| Fertiliser | Water-column feeder; benefits from iron |
| Substrate | Nutrient-rich or fine sand |
| Growth rate | Fast |
| Placement | Background |
| Difficulty | Medium |
Where it works and how to spread it
Plant cabomba in loose groups at the back of the tank, spacing each stem so water and light reach the lower leaves. It is brittle, so handle it gently — bruised stems shed needles. Propagation is simply cutting the top few centimetres and replanting; the cutting roots quickly and the parent branches below the cut.
What goes wrong
The classic failure is needle drop — bare lower stems and a carpet of shed leaves. It is almost always too little light, sometimes worsened by unstable CO2 (see our CO2 stability guide). Cabomba also dislikes strong flow blowing directly through it and resents frequent uprooting. Give it bright, stable conditions and leave it be, and it rewards you fast.
More plants in this series
- Hornwort (Ceratophyllum demersum) — the low-light feathery alternative
- Anacharis (Egeria densa) — the easy fast oxygenator
- Rotala rotundifolia — the colour-shifting stem plant
- Water wisteria (Hygrophila difformis) — the shape-shifting stem plant