Hi there
to me its sounds a perfect growing media, could do with knowing aspect etc
it sounds like a perfect site for growing hungry veg plants like pumpkins/squash etc, these need plenty of food and moisture also are very good at 'mulching' out weeds etc. then, you could plant perennial fruit bushes/trees but really need to know a bit more about the larger picture! fences? hedges? etc
are there any weeds that you recognise growing there?