We inherited two Victorian chimney pots from my inlaws. Over the years, we have tried growing things in them, either in pots, or filling them up with soil. Nothing lasted, always drying out too much and dying.
Hopefully we have now solved the problem. Some artificial plants, like boxes, always look really false to me. The other month, I found some artificial leylandii. Didn't buy them as they were too expensive. However, since receiving my pension, I decided to buy two and 'plant' them up: