Posted: 21/11/2012 at 23:05
I have grown flowers in tyres for years--actually terraced a slope with them. They take a lot of compost to fill them--mine were not on rims.I put perforated plastic on the bottom. I didn't paint them, though-just had trailing plants over the sides.
I made a pond in the kid's garden at school out of a huge skidder tire-placed plastic first, then cemented the bottom with ready-mix cement-it took 7 bags! It lasted for more than 10 years, complete with goldfish which grew to almost 12"--and water lilies.
The kids loved it-even though they stood on the tyre, it never leaked, surprisingly.