I have some in my 46g tank & its actually doing well at the moment. I've had it for probably 6 months or so. The biggest problem I've had with it is the snails munching on it & I had a spell of black beard algae. I bought it & then looked it up online, decided to keep it, glad I did. How long it'll last well I'll see.
It can survive for some time underwater but it does eventually die off being non-aquatic. A lot of terrestrial plants sold for aquarium use are marginal/bog plants and so can spend some time submerged before dying.