Hydrocotyle vulgaris, marsh pennywort, is a native European aquatic plant with small, round to kidney-shaped leaves on long, slender stems. In aquariums it can be grown submerged as a floating or creeping plant, while in pond set-ups and paludariums it thrives at the water margin with leaves emerging above the surface.
It is an undemanding species, growing under low to medium light without CO2 injection. It prefers cooler water and is better suited to temperate, coldwater, and unheated aquariums than to consistently warm tropical conditions. Its modest requirements make it accessible to beginners and those managing naturalistic or native species set-ups.
Supplied as an established potted plant, Hydrocotyle vulgaris suits temperate aquariums, outdoor ponds, and pond margins where its natural creeping and floating habit can be appreciated. It provides useful surface cover and a native, naturalistic look that complements other European aquatic species.