I know they are stunning gardens. The water might be slow but it is well worth it, I am not strict like you are in the fact I include here a lot of plants from the old homesteads and Iris... lots of Iris. I do have a wonderful pond this year with loads of native water lilies... they really need thinned out so the Round up - here some some water lilies!
There are several stands of PawPaw here in the area, but they are all in fairly shady thickets, and only at 20 or so feet do they get full sun.. I know they make fruit but the little creatures get them long before I got there. Will be checking on them - I do not have the right thick shade like they are starting in right now here to even try - but one day I will!