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Good question - I'll need to check soil (am very much a beginner gardener).
Loosestrife came up when I was looking before although it still seems to be mentioned as possibly invasive!;
andyfallsoff-
It is a native plant, I don't know how badly it self seeds.
We have some in the Belfast Hills but there is has to compete with grasses, so there isn't too much of it. I don't mind self-seeders myself, free plants! But perhaps a cultivar is more behaved?
Geum Leonard's Way (water aven) is also a nice plant, lots of flower and also likes a bit of damp.
JWestland
What sort of soil is it?
There are some native plants that like dampish soil near pond, Purple Loosestrife likes damp and sun. Irish Flag irises are another one.
Perhaps the gardener meant invasive, as-in, non-native should not be allowed to spread? Pheasantberry is one such plant...nice, but it goes everywhere and is on the "don't sell list" in Norn Ire.