hi morph
the transition time taken from emerse to submerse is a pretty difficult question to give you a presice answer as it depends very much in the conditions that you have provided for your tank...it can take anything from 7 days to never at all.....
Most aquatic (or marsh plant) in their natural habitat have two leave formation. This is because of the dramatic raising and falling water level due to extreme rain or dry seasons. The plant is able to 'sense its surrounding' pretty much as how it senses light and the plant itself will know when to have emerse or submerse leaves.









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