I'm going to bring in some perlite or peat moss this year (just a little bit for if the soil requires a little more air) but I try not to overdo it.
Clay based soils, though some air is necessary, do a great job of water retention. So for plots you don't plan on visiting all the time, go a little lighter than usual with the peat.
Someone on here (either D.S. Toker MD or moondawg IIRC) did an experiment where they grew in native, clay-based soil and their very airy organic mix. The plants grown in native soil yielded more every time (I believe he did it for three consecutive seasons); his theory was that the plants never went through heat stress because they always had water. On the other hand, the plants in his organic mix required him to haul in water all the time, and they dried out pretty quickly.
Now for your swamp spots this probably won't be an issue due to the swamp tubes, but it's something to keep in mind for planting in dry land.
Clay based soils, though some air is necessary, do a great job of water retention. So for plots you don't plan on visiting all the time, go a little lighter than usual with the peat.
Someone on here (either D.S. Toker MD or moondawg IIRC) did an experiment where they grew in native, clay-based soil and their very airy organic mix. The plants grown in native soil yielded more every time (I believe he did it for three consecutive seasons); his theory was that the plants never went through heat stress because they always had water. On the other hand, the plants in his organic mix required him to haul in water all the time, and they dried out pretty quickly.
Now for your swamp spots this probably won't be an issue due to the swamp tubes, but it's something to keep in mind for planting in dry land.