Blyxa japonica
Blyxa japonica (Miq.) Maxim. ex Asch. & Gürke
🌍 Asia · Japan · India · Sri Lanka · tropical
Common CO₂ Recommended Diff.: ★★★
📏 Midground
📈 Medium
True aquatic plant — has no emersed form. Grass-like yellow-green leaf, becomes bronze-reddish under high light. Compact rosette-like growth (actually a stem plant with closely spaced internodes). Naturally shoots downward for dense bushes. Flowers underwater — seed pods can germinate. Popular myth: Blyxa japonica needs soft water — this is WRONG. Tolerant of wide GH/KH range.
⚗️ Water parameters
🔵 KH
0–8 °dKH
Tolerates hard water — myth debunked
🪨 Rich soil recommended — root feeder
🇳🇱 Dutch Style
Versatile midground plant. Bronze tints under high light are beautiful in Dutch style.
💡 Tips
- Richer water column nutrients = faster growth
- Tolerates hard water — soft water NOT required
- Thin by cutting stems from bottom
- Leaf drop after purchase = normal (adaptation)
- Seed pods can germinate — bonus plants
🔍 Problems
⚠ Stays green, no bronze tint
→ Insufficient light
⚠ Leaf drop after purchase
→ Normal adaptation — give 2-3 weeks
Blyxa japonica Recurvifolia
Blyxa japonica 'Recurvifolia'
🌍 Asia — selected variety
Uncommon CO₂ Recommended Diff.: ★★★
📏 Midground
📈 Medium
More elegant variety of B. japonica with recurved (recurvifolia = recurved leaves) leaves that give the plant a distinctly ornamental appearance. Same care as standard japonica.
⚗️ Water parameters
🪨 Rich soil recommended
🇳🇱 Dutch Style
Elegant recurvifolia variant for Dutch style midground.
💡 Tips
- Recurved leaves give elegant appearance
- Same care as standard Blyxa japonica
- Slightly rarer in trade
🔍 Problems
⚠ Leaves upright
→ Insufficient light — recurving disappears
Blyxa aubertii Red
Blyxa aubertii 'Red'
🌍 Tropical Asia · India · Sri Lanka · Thailand
Uncommon CO₂ Recommended Diff.: ★★★
📏 Midground/Background
📈 Medium-fast
Larger species than B. japonica. Red/bronze tint under high light. Can reach 30-40cm tall — plan space for background. Stronger growing than japonica.
⚗️ Water parameters
🪨 Rich soil recommended
🇳🇱 Dutch Style
Larger red Blyxa for mid- or background in Dutch style.
💡 Tips
- Larger species than B. japonica
- Red/bronze tint under high light
- Can reach 40cm — more space needed
🔍 Problems
⚠ No red
→ Insufficient light
Blyxa kasaragodensis
Blyxa kasaragodensis
🌍 India · Kasaragod district (Kerala)
Rare CO₂ Required Diff.: ★★★
📏 Midground
📈 Slow
Extremely rare Blyxa species endemic to the Kasaragod district in Kerala, India. Smaller and more compact than B. japonica. More difficult to keep. Limited availability in trade.
⚗️ Water parameters
🪨 Rich soil required
🇳🇱 Dutch Style
Rare compact Blyxa for advanced Dutch style aquarists.
💡 Tips
- Extremely rare — preserve all specimens
- Smaller than B. japonica
- More difficult to keep — soft water recommended
🔍 Problems
⚠ Not growing
→ Parameters too far from biotope optimum
Blyxa octandra
Blyxa octandra (Roxb.) Planch. ex Thwaites
🌍 Asia · India · Sri Lanka · Malaysia
Rare CO₂ Recommended Diff.: ★★★
📏 Midground/Background
📈 Medium
Larger rarer Blyxa species. Eight stamens (octandra = eight stamens). Can grow to 50cm. Less common than japonica. Similar care but requires more space.
⚗️ Water parameters
🪨 Rich soil recommended
🇳🇱 Dutch Style
Large rare Blyxa for spacious Dutch style aquariums.
💡 Tips
- Can reach 50cm — larger tank needed
- Rarer than B. japonica
- Similar care to japonica
🔍 Problems
⚠ Slow growth
→ Insufficient light or nutrition
Data: STRAAT Dutch Style · Aquasabi · community-verified sources | 2026 Aquabloom
