Hydrocotyle vulgaris Care Guide
Hydrocotyle vulgaris is a European marsh pennywort with rounded peltate leaves on long petioles, suited to coldwater aquariums and pond margins.
Compiled by Aquairi from published sources · Published · Updated
Overview
Hydrocotyle vulgaris, the marsh or common pennywort, is a creeping perennial of the family Araliaceae described by Linnaeus. Its rounded, shield-shaped (peltate) leaves, up to about 4 cm across, attach to the petiole in the middle of the leaf underside, giving an umbrella-like form. The plant stays low, around 5-20 cm tall, with creeping stems up to a metre long.
Taxonomy
- Family: Araliaceae
- Genus: Hydrocotyle
- Scientific name: Hydrocotyle vulgaris
- Order: Apiales
- Authority: Linnaeus
Habitat
The species is native to Europe (and parts of North Africa, the Caucasus and the Levant), where it grows in wet places such as fens, swamps, bogs and marshes. In Britain it is the only native Hydrocotyle. Its temperate, wetland origin suits coldwater and pond use.
Tank requirements
- Water type: freshwater
- Temperature: 12-24 °C (54-75 °F)
- pH: 6.0-7.8
- GH: 4-18 °dGH
- Lighting: medium
- CO2 injection: not required
- Placement: midground; height up to ~20 cm
Growth and propagation
Hydrocotyle vulgaris spreads by runners and propagates mainly vegetatively rather than by its tiny, inconspicuous summer flowers. It grows readily both submersed and emersed, making it useful at pond margins and in open-top setups. Periodic trimming of runners, roughly every two weeks, keeps it contained.
Notes
Its conservation status varies by region: the species is protected under French legislation and considered critically endangered in Croatia, even though it is widespread elsewhere in Europe.
Propagating Hydrocotyle vulgaris (Marsh Pennywort)
Overview
Hydrocotyle vulgaris, the marsh pennywort, is a creeping wetland perennial reaching only 5 to 20 cm in height. It produces numerous creeping offshoots up to one metre long that spread horizontally across wet substrate. Its hallmark is the serrated, rounded, shield-shaped (peltate) leaf, up to 4 cm across, with the petiole joining at the centre of the leaf underside, giving an umbrella-like look.
In the aquarium it behaves as a trailing, medium-growth plant. Because it spreads by horizontal runners rather than vertical stems, it is multiplied by dividing those runners, not by topping cuttings.
Propagation Method
The plant reproduces vegetatively through its creeping offshoots (runners and rhizome). Each runner roots at its nodes and sends up new leaves, so a single plant becomes a colony. To propagate, you simply divide an established runner into rooted sections and replant them. Flowers exist but rarely bloom, so seed is not a practical route in cultivation.
Step-by-Step
- Choose a healthy parent with several long creeping runners trailing across the substrate.
- Trace a runner and identify nodes where roots and new leaves have formed.
- Cut the runner between nodes into sections, each carrying at least one rooted node and a few leaves.
- Replant each section into moist or submerged substrate, pressing the rooted node gently into place.
- Keep new sections in position; the runners will re-anchor and send out fresh offshoots within weeks.
Conditions for Healthy Growth
Marsh pennywort thrives in wet places such as wetlands, marshes and swamps, and tolerates mud at a pond edge in up to a few centimetres of stagnant water. It prefers reliably moist humus in full sun to part shade and grows well in coldwater and pond setups. In the aquarium it accepts medium light and does not require CO2.
Maintenance
As a fast spreader it needs regular trimming, roughly every couple of weeks, to keep it low and dense and to stop it overrunning neighbours. Routinely tucking stray runners back into position maintains a tidy carpet, and trimmings double as ready-made propagation material.
Common Challenges
Despite its aquatic habit, over-watering of emersed plants can still cause root rot, so emersed pots should drain. Runners can spread aggressively beyond their intended zone, and in low light the trailing growth becomes leggy with longer petioles. Regular division and trimming keep both problems in check.