Purple Marshweed
Limnophila hippuridoides
Plantaginaceae
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About
A large Malayan stem plant that arrives green and unremarkable, then rebuilds itself underwater into one of the deepest purples in the hobby. Every node carries a whorl of six to eight solid, lance-shaped leaves with finely serrated edges; under strong light the blades run dark red and their undersides turn violet, while the same plant under weak light simply stays green and stretches. That whorl is also how you tell it apart from its relatives. Limnophila sessiliflora and L. aquatica have feathery leaves split into fine needle-like segments and are always light green, so one glance at a node settles the question. L. aromatica is the real look-alike: the same solid, serrated, aromatic leaves, but only two or three of them per node and a far more changeable colour that often stays green. Crush a leaf of any of them and you get a distinct spicy scent.
Care
This is a high-light, CO2-injected plant and there is no honest way to sell it otherwise. At roughly 50 PAR and up, with pressurised CO2, full NPK and steady iron, it colours deeply and grows fast; without CO2 it usually survives only as a leggy green stem that sheds its lower leaves. Plant single stems 6-8 cm apart in a nutrient-rich substrate at the back or as a midground group - a settled shoot spreads 6-10 cm wide, and stems set any closer shade each other and drop their lower leaves. Give it moderate flow, and expect the emersed leaves it ships with to melt away as the submersed form takes over - that melt is the conversion, not a dying plant. Top it around 25-30 cm and replant the cuttings; the stumps branch and the group thickens. Keep iron dosed, because colour is the first thing to fade when trace elements run short.
Frequently asked questions
- What water parameters does a Purple Marshweed need?
- Purple Marshweed does best at 15–30 °C (59–86 °F), pH 5.5–7.5 and a general hardness of 2–18 °dGH.
- Where should Purple Marshweed be placed in the aquarium?
- Purple Marshweed works best at the back of the tank and reaches around 50 cm.
- Is the Purple Marshweed suitable for beginners?
- Purple Marshweed sits in the middle of the difficulty scale — manageable for a careful beginner who has done the reading, but it has specific needs worth researching first.