Hygrophila lacustris Care Guide
Hygrophila lacustris (a synonym of Hygrophila costata, Acanthaceae) is a Neotropical stem plant with pale green leaves tolerating a wide range of conditions.
Compiled by Aquairi from published sources · Published · Updated
Overview
Hygrophila lacustris is an aquatic stem plant of the family Acanthaceae. It is treated as a synonym of Hygrophila costata, a highly variable species. It bears pale green, lance-shaped leaves and tolerates cooler temperatures and a wide range of water conditions, and is cultivated as a freshwater aquarium plant.
Taxonomy
- Family: Acanthaceae
- Genus: Hygrophila
- Scientific name: Hygrophila lacustris
- Synonym: Hygrophila costata
Habitat
The species is native to the Neotropics, ranging from the southern United States (including Florida) through the Caribbean, Mexico and Central America into southern South America. It grows in aquatic habitats and, through use as an aquarium plant, has become invasive in some regions such as Australia. White flowers distinguish it from its Asian relatives.
Aquarium requirements
- Temperature: 18-28 °C (64-82 °F)
- pH: 6.0-8.0
- GH: 3-16 °dGH
- Lighting: medium to high
- CO2: not required (beneficial)
- Maximum height: up to about 40 cm
- Placement: background
Growth and care
This is a fast-growing stem plant that adapts to a broad range of conditions, including cooler water than many tropical Hygrophila tolerate. Its leaf form is variable. Regular trimming keeps the stand neat and encourages branching.
Propagation
Propagation is by cuttings; the plant can also reproduce by seed. Cut shoot tips replanted into the substrate root and continue to grow.
Propagating Hygrophila Lacustris from Cuttings
Overview
Hygrophila lacustris, the lake hygrophila, is an aquatic plant native to Florida, the Caribbean, southern Mexico, Central America, and South America, and treated as a synonym of Hygrophila costata. It is a fast, hardy background stem plant with narrow, willow-like leaves and tolerates a wide range of water conditions. Like other hygrophilas it is propagated from stem cuttings.
Propagation Method (Cuttings)
This plant is multiplied by topping: cut off the top half of a healthy stem and replant the trimming to grow a new plant. The base left in the substrate grows new leaves from the cut tip and pushes out side shoots, so each planted stem branches into a denser clump over time.
Step-by-Step
- Pick a healthy stem with a vigorous growing tip.
- Cut the top 5–10 cm with clean, sharp scissors.
- Strip the lowest 2–3 cm of leaves to prevent rot in the substrate.
- Plant each cutting deeply and individually, leaving room for roots.
- Leave the trimmed base rooted; it will branch and regrow from the tip.
- If a cutting has no roots, float it until roots form, then plant it.
Conditions for Healthy Growth
This is an undemanding, fast grower that accepts a wide range of water conditions and even tolerates cooler temperatures than most tropical stems. Medium to bright lighting keeps growth compact and the foliage healthy; too little light causes weak, stretched stems. It grows readily submersed in the aquarium and, like other hygrophilas, can also grow emersed with somewhat different leaves.
Trimming & Maintenance
Because it grows quickly, top and replant roughly every week to ten days to keep the planting dense and prevent shading of neighboring plants. Each trim doubles as propagation: replant the healthy tops and let the bases rebranch. Remove any bare, leggy bases that have lost most of their leaves.
Common Challenges
- Stretched, pale stems indicate insufficient light — increase intensity.
- Lower leaves dropping under tall growth; top regularly to stay compact.
- Cuttings floating loose — plant deep or weight them until rooted.
- Aggressive spread where conditions suit it; trim often and dispose of cuttings responsibly.