What To Do With Extra Plants or Rumble in the Tree Pits

I seem to always pick plants for the garden that spread all over. Self seeders, stoloniferous plants, runners running every which way. Oenothera, Chrysanthemum Koreanum, Eupatorium, perennial sunflower, seaside solidago, alchillea -garden and field varieties, asters.

What to do with these spreading plants. I started putting them in the new tree pits across the street. There is a dirt strip there full of grasses and amaranth and other unidentified weeds. So I put my spreaders in the new tree pits and we'll see what wins out.  

Hopefully not the dog walkers. While planting, I found three plastic bags filled with dog shit and tied up -left in the tree pit. Why go through all the trouble of bagging your dog's business and then throw it on the sidewalk? 

Anyhow, I don't water these guys in the garden, so my hope is they'll take root over there and spread.