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Plant Freshwater Care: medium

Blyxa Japonica

Blyxa japonica
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Other names: Blyxa, Japonica
Group: Foreground and carpet plants · Family: Hydrocharitaceae · Origin: South and East Asia — rice paddies and shallow waters of Japan, China, India and Southeast Asia

A foreground-to-midground plant whose grass-like narrow leaves form dense clumps on short stems, taking on bronze-reddish tones under strong light. It needs soft water, a nutrient-rich substrate and CO₂.

Last updated October 16, 2026

Temperature
20–28°C
pH
5.5–7
Hardness
1–8 dGH
Light
High
CO₂
Required
Growth
Medium
Placement
Foreground
Height
Up to 10 cm

Water parameters

Temperature20–28°C
pH5.5–7
General hardness (GH)1–8 dGH
Recommended range

Overview

October 16, 2026 · Suggest an edit

Blyxa japonica grows in the rice paddies and shallow waters of Asia and at first glance looks like a clump of grass. It actually consists of narrow, long leaves arranged in a spiral on a short stem; these stems branch and build dense clumps 8–10 cm high. Under strong light the leaf tips take on a bronze, orange or reddish tone. It is often used at the base of stones and driftwood in nature aquariums. It needs soft water, a nutrient-rich substrate and regular CO₂; if these conditions are not met, it melts.

Planting and Placement

October 16, 2026 · Suggest an edit
  • Separate the clumps into individual stems and plant them 2–3 cm apart and 2 cm deep.
  • It is used in the foreground or midground, at the base of stones and between pieces of driftwood.

Care and Fertilization

October 16, 2026 · Suggest an edit
  • Light: High.
  • CO₂: Required.
  • Water: Soft (GH 1–8), slightly acidic.
  • Fertilizer: Active substrate and root tabs; with nutrient deficiency the leaves turn pale.
  • Trimming: Lengthening stems are cut and replanted; when clumps get crowded, they are separated and thinned out.

Propagation

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Common Problems

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Hobbyist notes

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Change history and contributors
  1. Page created · October 16, 2026