Those copper plant troughs were cool once. I would use them to grow miniature Amazonian jungle plants or Californian primulas in my living room. Now plant holders are pared back and no longer labour intensive. Once I polished this copper. Now I would consider that a waste of time.
He kindly drills holes in the bases. Some broken china, earth, fertiliser pellets and seasonal plants like winter pansies and the garden has some updated additions. The copper will turn green. The verdigris will add colour and texture to a small area like a windowsill.
The copper will age gracefully.