Massachusetts, 6b, full sun, poor soil.
Right now, this garden I inherited has basically been neglected for years, so I'll be cardboard mulching to suppress the weeds/grass and making plans for next spring. And because it's 200+ ft away from a spigot, regular watering to help the plants establish themselves after a transplant is going to be a struggle.
Hence I'm looking for super strong natives that you'd have to try to kill. And that can even survive transplant shock with minimal extra care. Aggressiveness would also be good because even with cardboard mulching I imagine they'll still get pretty strong competition from the weeds. And there's this persistent oriental bittersweet hanging around too.
Right now I'm looking at Black Eyed Susans. And yarrow maybe? I also hear good things about asters and goldenrods, but any specific species recommendations?