Posted: 31/05/2015 at 18:56
Lysimachia nummularia is another good at the edge of a pond plant. Ragged robin as well. It's nice to have a few uprights like irises but the native Iris pseudocorus is too much for a small pond and I'd go for something not native but better behaved.
There are no strict rules, different creatures inhabit different types of pond. Sun shade, shallow, deep, wherever you find a pond, something will be using it.
I've never seen a chamomile lawn that look great but maybe yours would be the first. But think about wildlife pond, is a chamomile lawn something that sits easily beside that?