Willow Hygro (Hygrophila angustifolia) is a fast-growing stem plant with long, narrow leaves that taper to a point and are arranged in opposite pairs along upright stems — a leaf form that closely resembles the narrow, willow-like foliage of certain terrestrial plants and gives the aquarium plant a distinctly fine, soft-textured appearance that the broader-leafed Hygrophila species do not produce. Positioned in the background, a group of Willow Hygro stems fills the upper water column with soft, upright, fine-textured green foliage that provides a different background quality from either Vallisneria's flowing ribbons or the structural density of broader-leafed background plants. It grows rapidly under virtually any light level above the minimum, tolerates a very wide range of parameters, and propagates by cuttings — trimmed tops replanted immediately produce the next generation of upright stems. One of the easiest and most rewarding beginner stem plants available. Fully safe with all Neocaridina, Caridina, and snails.
Not RequiredCO₂
64–84°FTemperature
Low–HighLighting
What to Expect
Growth & Appearance
Long, narrow, willow-like leaves in opposite pairs along upright stems — each leaf is 4–8cm long and only a few millimetres wide — a narrow, lanceolate form that tapers gracefully to a point and sits opposite its pair along the stem at regular intervals. The overall impression of a stem at full height is a fine, soft column of narrow leaves that reads as more delicate and graceful than the broader leaves of most Hygrophila species while still being clearly distinct from the grass-like forms of Vallisneria or hairgrass.
Fast growth under low to high light — one of the most adaptable stem plants — Willow Hygro grows across a wider light range than most stem plants in the catalog, producing noticeable growth under low light conditions where many stem plants stagnate, and growing very quickly under medium to high light. This adaptability makes it one of the safest stem plant choices for tanks with variable or uncertain lighting — it adjusts its growth rate to available light rather than failing outright under non-ideal conditions.
Bright green under most conditions — slightly reddish under high light with iron — under standard low to medium light conditions leaves are a clear, consistent bright green. Under high light with consistent iron supplementation the leaf margins and new growth develop a subtle reddish or bronze tint that adds warmth to the fine-textured background without approaching the vivid colour of dedicated red stem plants. Without iron the plant remains solidly green regardless of light level.
Propagates easily by stem cuttings — trim and replant the top — when stems reach the surface or become too tall, cut the top 10–15cm with scissors, strip the lowest 3cm of leaves, and replant the cutting immediately in the same position or adjacent. The remaining lower stem will produce new side shoots from the leaf nodes below the cut. Repeat this process every four to six weeks in a well-lit tank to maintain a dense, bushy background planting.
Provides excellent biofilm surface area and shrimplet cover — the numerous leaf surfaces along each stem accumulate biofilm that shrimp graze continuously, and the fine-leaved, densely planted background structure provides physical cover for shrimplets and young shrimp navigating away from the more exposed foreground areas. The fine leaf form means shrimp are visible on and between the leaves — easier to observe than in plants with broader leaves that conceal individuals behind them.
How to Set It Up
Getting Started
1Plant in groups of five to seven stems in the background — strip the bottom 3cm of leaves from each stem and push into substrate 2cm deep, spacing stems 2–3cm apart in a group. A cluster of five to seven stems planted together produces a more immediately dense and visually coherent background presence than individual stems spaced widely — the group reads as a plant mass rather than individual stems.
2Low to medium light is sufficient — increase for faster growth — Willow Hygro grows at a useful rate under low to medium light. If faster growth or subtle reddish colouration is desired, increase light intensity and add iron to the liquid fertiliser routine. The plant does not require high light and performs well at whatever light level the tank is running for the benefit of other inhabitants.
3Trim tops and replant on a four to six week cycle — establish a regular trimming rhythm once the background planting is at the desired height. Cut the top 10–15cm of each stem, strip the lowest leaves, and replant immediately in front of or beside the original stem position. The original stems branch from the cut points; the replanted cuttings root and grow upward. Repeat to maintain density.
4Fertilise consistently with balanced liquid formula — liquid fertiliser dosed two to three times weekly supports rapid growth and the healthy green leaf colour that makes Willow Hygro effective as a background filler. Iron inclusion is more important if subtle red colouration under high light is the goal; for a plain green background a comprehensive macro and micro formula is sufficient.
💡 Bonus Tip
Willow Hygro planted in a dense group immediately behind a cluster of Anubias barteri on driftwood creates one of the most effective midground-to-background transitions in a low-tech planted tank — the broad, static, dark green Anubias leaves in the midground contrast sharply with the fine, upright, lighter green Willow Hygro stems rising behind them. The size, texture, and movement character (still Anubias versus slightly responsive Hygro) are all contrasting, and both plants share near-identical care requirements.
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Browse more aquatic plantsPair Willow Hygro with Bacopa, Vallisneria, or Anubias for a complete planted background. Browse our Aquatic Plants collection.
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