anyone grow marshmallow?

Have got 2 marshmallow plants and dont really know how to deal with them can anyone help? They have very long tap roots and when I first planted it part of the root was showing and it didnt seem to like this so I replanted it deeper and it has made some top growth now so presume its ok and likes a sunny place? anyone know how to propogate it?

 

Marsh mallows like it wet as their name suggests. Are you certain that it is a marsh mallow as there are several different mallows all requiring very different conditions. This is a phot0 of marsh mallow:
http://ip30.eti.uva.nl/bis/flora.php?selected=beschrijving&menuentry=soorten&id=2149

 

oh Hornbeam, I always thought I grew marshmallow - or rather it graced me with its presance, for i never planted it.

But after seeing your pic, I am now beginning to wonder.

 

The mallows usually seen are the common mallow, tree mallow and the musk mallow

 

I have some marshmallow but its not in flower yet..hornbeams picture is the same as the one i have ..I dont harvest mine i just like to keep it mine is in a damp area by my leaking pond!!