DIFFICULTY Moderate

Benefits from more deliberate care.

LIGHT High

Around 10 hours is a useful starting point.

CO₂ Recommended

Can grow without it, but responds noticeably to supplementation.

GROWTH Medium

Weekly trimming needs.

PLANT OVERVIEW

About Blyxa japonica

A grassy rosette that bronzes red under strong light.

Blyxa japonica forms bushy rosettes of fine, grass-like leaves that turn from green to bronze-red under high light, CO2 and iron. It roots into the substrate rather than growing as a stem, making a soft, mounding midground clump in high-tech tanks.
Shrimp friendly Nano suitable High-tech suitable Fry cover
CARE PROFILE

What this plant needs.

The useful numbers and practical notes, grouped around how you actually keep the plant.

TANK FIT

Placement + size

Primary placementMidground
Typical height3–8 in
Typical width5 in
Suggested minimum tank10 gal
Suggested tank height12 in+
LIGHT + CO₂

Energy demand

Ideal lightHigh
Photoperiod range8–12 hr
Approx. PAR40–100
Injected CO₂Recommended
CO₂ benefitHigh
NUTRITION

Where it feeds

Root feedingModerate
Water-column feedingModerate
Overall fertilizer demandHigh
Iron demandHigh
MicronutrientsModerate
WATER

Useful parameter range

Temperature70–82°F
pH5.5–7
GH1–10 dGH
KH0–6 dKH
PLANTING

How to plant it.

Substrate: Nutrient-rich substrate

Plant rosettes into rich substrate; iron and CO2 bring out bronze-red tones.

GROWTH + PROPAGATION

What to expect after planting.

Propagation

Stem cuttings

Acclimation

Transitions from emersed to submersed growth after planting.

COMMON PROBLEMS

What usually goes wrong.

Leggy with poor lower leaves in weak light or low CO2.