You know, they are known as "ditch lilies" in a wide part of the US and that has to say something...if they grow in ditches, they must be able to tolerate/like wet soil. Great pics by the way! And you should check out carnivorous plants...they are all bog plants and I was amazed to find out how many there are, and a lot are native to the US. We've got a local grower here ...if I can find his address I'll pass it on to you.