Marsh Isnardia (Ludwigia palustris): a red and easy plant for aquarium and pond
A creeping, oxygenating, and hassle-free plant
Marsh Isnardia is an extremely adaptable amphibious plant: it grows in calm water as well as in waterlogged soil, out of water, and thrives equally well in aquariums and ponds. Its thin, branched stems root easily, and its leaves change from green to red depending on the light. Outdoors, it forms dense cushions, true impenetrable meadows that serve as shelter for microfauna, tadpoles, and small fish.
Why choose Marsh Isnardia?
- Color changes: all shades from green to coppery red depending on the light.
- Oxygenating and purifying: helps limit algae thanks to its rapid growth that ruthlessly competes with them.
- Undemanding: parameters are practically indifferent, compatible with low-tech setups.
- Easy propagation: simple cuttings (tips or segments). Lay a stem down and it will root along its entire length and form new stems!
- Pond and pool: its dense cushions are a safe refuge for wildlife: water lice, fry, snails...
- Strong stems: do not fragment spontaneously, do not break on impact; therefore, it is easier to manage and does not spread uncontrollably.
Planting and care tips
- Light: medium to strong for very pronounced red tones.
- Substrate: sand or gravel is sufficient. It roots quickly and easily.
- Parameters: soft to moderately hard water. Adding CO2 is completely unnecessary.
- Pruning: cut above a node and replant the tip. The base will sprout and the cutting will grow.
- Pond: install in calm areas. Thin out if the cushion becomes too dense or too wide for your taste. Plant it, for example, at the base of larger plants, like Sumpf-Schwertlilie or Purple loosestrife.
Possible uses of the Sumpf-Schwertlilie
- Low-tech aquarium: colorful mass in midground or background. It can emerge in an open aquarium.
- Aquascaping: contrasting and exuberant red plant, creeping ground cover.
- Pond and pool: refuge cushions for fry, tadpoles, or water lice. Perfect for hiding the liner and covering edges.
FAQ - Sumpf-Schwertlilie (Ludwigia palustris)
Can it be grown in low-tech setups?
Yes, very well, without CO2 or filter, just good light.
How to achieve an intense red color?
Increase lighting. Optionally add a little iron unless there are fish, especially if they are fed live food. In that case, no deficiency occurs because iron comes through this route.
Is it suitable for ponds?
Yes. Regular and significant growth, dense cushions, and a refuge role for fauna and microfauna. It withstands winter and regrows in spring.
What is its growth rate?
Fast, especially if the light is strong. It rarely stagnates; it’s more of a champion!
Is it suitable for beginners?
Perfectly. One of the easiest plants, it is tolerant and very decorative.
Additional information
- Scientific name: Ludwigia palustris
- Plant type: oxygenating aquatic stem plant
- Light: medium to strong
- Temperature: -10 to 28°C. In aquarium or pond, even in winter
- Current: it prefers calm waters
- Size: about 10 to 40 cm
- Packaging: 3 stems with roots (approximate weight: 20 g).
- Guarantee: without rock wool or any artificial substrate of any kind.
- Recommendation: As a precautionary principle, please never release this plant into the wild, even if it is sometimes found there. Our ecosystems are fragile and must be preserved.
