Posted: 30/04/2014 at 21:27
For my small pond I added a fringed water lily ( lovely yellow flower, looks very much like a lily but it's leaves are smaller) you site it at the bottom and it is best grown in a pot in a small area of water. Mine is only 30cm deep so I'm being careful not to have too much in there.
I also put in some star wort and water crow foot. ( needs thinning out from time to find but is manageable in a small pond) As far as I know these are native plants.
For the marginal plants, I put in a ragged robin and a sedge. I'm sure someone else will be along soon to give you more ideas