Water milfoil: an oxygenating, cleansing, and decorative plant for natural aquariums and ponds
What is Water milfoil?
“Red Stem” Water milfoil (Myriophyllum rubricaule) is an aquatic plant with reddish stems covered in finely divided leaves that form a delicate, light-green lace (which can turn copper-red under intense light). It grows both planted and floating, anchors itself to the bottom with long filaments, and thrives indoors and outdoors, from low-tech aquariums to ponds.
Why choose Water milfoil for a natural aquarium or pond?
- Powerful oxygenation: when submerged, it improves dissolved oxygen levels for fish and invertebrates.
- Natural filtration: whether submerged or emergent, it rapidly absorbs nitrates and phosphates and slows algae growth. Ideal for low-tech setups.
- Fry refuge: its foliage and network of intertwined stems are appreciated by fry and shy fish.
- Highly versatile: thrives even without substrate or CO₂ and is suitable for low-tech aquariums, ponds, and outdoor tub setups.
- Unique aesthetics: creates a feathery “forest” underwater or a light-green canopy above the water.
- Hardy: in ponds, it easily withstands goldfish and koi.
Water milfoil care
- ✂️ Fast growth: trim, pinch, or lay down the stems to control their height and prevent them from becoming bare.
- 🌡️ Temperature: 3 - 30 °C (it survives winter perfectly well in ponds).
- 💡 Light: moderate to high. The coloration becomes redder under intense lighting.
- 🌱 Quick propagation: a single fragment is enough to create a new plant.
- 🔗 Securing: anchor the stems in sand or décor, or simply let them float; the plants will anchor themselves with their “root-like” filaments (false roots).
Tips for using Water milfoil effectively
- 🌿 Place it in the background or create a jungle of intertwined stems.
- 🎨 Pair it with broad-leaved plants for visual contrast.
- 🔧 Use it as a living filter in tanks without pumps and in ponds.
- 🌞 Perfect for open-top tanks: the emergent stems, with their different leaves, create a beautiful light-green aerial herb garden and lightly shade the entire tank.
- 🦐 Combine it with microfauna (water lice, planorbids...) for an active ecosystem.
Water milfoil FAQ for aquariums and ponds
Does water milfoil float?
It can float freely or anchor itself by sending “root-like” filaments toward the bottom.
Is it suitable for low-tech aquariums?
Yes. It only requires adequate lighting and regular trimming. No heater, filtration, or specialized substrate is needed.
Does it need substrate?
No. It absorbs nutrients through its leaves alone and only anchors itself to withstand the current.
How should it be trimmed?
Cut back stems that are too long and bare, then replant the tips to thicken the clump.
Can I use it in an outdoor tub setup?
Absolutely; it tolerates temperature fluctuations and overwinters outdoors.
Additional information
Scientific name: Myriophyllum rubricaule, or “Red stem”.
Adult height: 15 - 50 cm (stem length), and up to 2 m in large ponds
Packaging: pack of 3 stems (indicative weight: 20 g)
Guarantee: no rock wool or artificial substrate
Recommendation: NEVER release the plant into the wild; our natural ecosystems are fragile
