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Type: Runners
Origin: Asia
Growth rate: High
Height: 3 - 5+
Light demand: Medium
CO2 : Medium
General Description
Hygrophila serpyllum, commonly referred to as the Marsh carpet, is a small, creeping plant native to India, where it thrives in periodically flooded and dry wetlands. This species, distinct from other Hygrophila plants commonly found in the aquarium hobby, has gained recognition as an aquarium plant only in recent years. Its creeping and branched shoots, capable of rooting at stem nodes, form a mat at least 3 cm high or a broad bush over 5 cm high in underwater conditions, especially under low light. The plant's small, roundish leaves, reminiscent of pennywort (Lysimachia nummularia), and thin but tough stems contribute to its unique appearance. In its emersed form, Hygrophila serpyllum forms a small-leaved mat with upright flowering shoots bearing small white-blue flowers.
Aquarium Suitability
Hygrophila serpyllum is a relatively easy and fast-growing aquatic plant, making it a suitable addition to aquarium flora. It adapts well to various water conditions without specific demands on pH value and water hardness. The plant’s moderate CO2 requirement and the need for a complete supply of macro and micronutrients via the water column facilitate its healthy growth in aquariums. While its light requirements are moderate, strong lighting promotes its low, creeping growth, allowing aquarists to cultivate either a closed mat or a wide bush depending on the lighting conditions.
Demands and Hardiness
As an adaptable and resilient species, Hygrophila serpyllum does not have stringent demands regarding water parameters, making it suitable for a range of aquarium environments. It benefits from moderate CO2 levels and nutrient-rich water. The plant’s ability to thrive in varying light conditions further enhances its appeal, with stronger lighting encouraging denser, creeping growth. Due to its robustness, this plant is suitable for both beginner and experienced aquarists seeking to enhance their tank’s aesthetic.
Aquascaping & Usage
In aquascaping, Hygrophila serpyllum is valued for its versatility and visual appeal. It can be used as a ground cover, forming a lush, creeping mat that adds depth and texture to the aquarium landscape. The plant is also effective in creating a wide bushy appearance, particularly under moderate lighting conditions. Its small, round leaves and thin stems provide a delicate contrast to other larger-leaved or upright-growing plants. Additionally, Hygrophila serpyllum is an excellent choice for emersed setups such as paludariums and wabi-kusa, where it produces a visually striking mat with numerous small white and blue flowers.
Propagation
Propagation of Hygrophila serpyllum is straightforward and typically involves planting clumps of several shoots at a distance from each other in the substrate. The creeping shoots will naturally form a closed mat over time, facilitating the plant’s spread. For those looking to grow a bushy appearance, moderate lighting will encourage this growth form. Regular trimming and replanting of cuttings can help maintain the desired shape and density of the plant within the aquarium or emersed setup.
Habitat and Distribution
Hygrophila serpyllum is widespread in India, where it colonizes various wetlands that undergo periodic flooding and drying. This adaptive nature allows the plant to thrive in both submerged and emersed conditions. In its native habitat, the plant forms low, richly flowering mats, reminiscent of wild thyme, hence its specific epithet serpyllum. The plant's ability to adapt to different moisture levels and its resilience in fluctuating environmental conditions contribute to its success in diverse habitats.
