Hygrophila Siamensis is a fast-growing Southeast Asian stem plant in the Hygrophila corymbosa complex — "Siamensis" is in fact an older trade name for Hygrophila corymbosa itself, and this broader-leaved standard form is a different look from the narrower-leaved 'Siamensis 53B' cultivar we already carry. Both are the same species group; this is simply a different, wider-leaved trade form.
Care tip: Hygrophila Siamensis is about as forgiving as aquarium stem plants get — it tolerates a wide range of water conditions and grows well without CO2, making it a dependable choice for new planted tanks.
This plant thrives in low to high light without CO2 injection, tolerating pH from 5.0 to 8.0 and temperatures from 64 to 86°F. Its rapid growth acts as a natural nutrient sponge, helping outcompete algae for available nitrates. Regular trimming and replanting of cut tops keeps growth bushy rather than tall and sparse.
As a background stem plant, Hygrophila Siamensis fills space quickly and provides dense cover, making it a practical choice for beginners setting up a new planted tank or anyone wanting fast, reliable background growth. It can also be grown emersed in paludarium setups, where it produces sturdier leaves above the waterline.
| Difficulty | Easy |
| Placement | Background |
| Max Height | 12–24 inches |
| Light Level | Low to High |
| Temperature | 64–86°F |
| pH | 5.0–8.0 |
| CO2 Needs | Not Required |
| Origin | Thailand, Southeast Asia |
| Notes | Broader-leaved trade form within the H. corymbosa complex. Extremely fast-growing and beginner-friendly; helps outcompete algae. |
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