I like pickerelweed (already planted some last year), bullrush, arrowhead, and blueflag iris. All are native and beneficial for fish/ponds, I believe. If it is simply a matter of planting,
I don't think the marginal shoreline plants will remove a significant amount of nutrients from the pond water. Absorption of most of the available pond nutrients are IMO done by submerged vegetation. The alga Chara also absorbs and binds lots of nutrients. When all vegetation dies and sinks in the pond all nutrients are recycled. Canyon Creek noticed a lot less FA growth after a few years of heavy FA removal. Other pond owners have also experienced similar results after removing lots and lots of FA.
