So many plants, so little room

As ponds are starting to overgrow, more people are giving away plants. I'm
looking for cheap suggestions about planting emergent bog plants out of the
pond and probably in dirt=no mosquitos. I thought of digging oversized
holes, lining with a trash liner and refilling with dirt or possibly a
vermiculite lighter potting soil. Is this kind of thing feasible? Would
you mulch them to decrease evaporation? Any plants more appropriate? I've
already eliminated water lilies, submerged and floating plants
Thanxx
Bill Brister - Austin, Texas