Grow lots of potatoes- smother weeds and make a wonderful difference to the texture of the soil
I took on my long-neglected adjacent plot last year because I was sick of looking at it, and the bindweed kept creeping over into mine. The soil was compacted, hard, clayey and full of broken glass, plastic and perennial weed roots.
After digging out the bits and a crop of Kestrel, when I came to turn it over a couple of weeks ago the soil was so friable that I hardly needed to push the fork in- just drop it . That was an exaggeration but only a slight one!