This planter may appear unassuming in the photo, but don't be fooled.
It's made from cast molded polyurethane rubber and weighs 24 pounds, the better to keep your outdoor plants from running away.
Designed by Swedish industrial designer Johannes Norlander, the rubber planter is perfect for a small tree. It has an extra thick bottom to help root it firmly to the sidewalk or deck, a drainage hole to help keep it alive, and a tall cuff which can be folded up or down to suit your tree's mood: demure or frisky.
The rubber planter is quite the splurge ($995), from Nova68.