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The leaves of emergent grown Hygrophila corymbosa
"Siamensis" are blue-green, but grown submerged they turn into
beautifully light-green with very short internodes. In case of iron
deficiency, however, the new leaves will be very pale. Hygrophila
corymbosa "Siamensis" requires quite high light intensities but
apart from this it does not need any special water composition.
If Hygrophila corymbosa "Siamensis" grows too tall the top
can be cut and replanted into the substrate. The mother plant will develop
new adventitious shoot and become more bushy. The
plant likes to set shoots above water level and this can happen in open
aquariums where the leaves again turn blue-green and beautiful flowers often
develop
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