My husband saw an info-mercial on upside down planters late one night and thought it would be a fun project to do with the kids. It was very easy to make but not very pretty. It was made out of a gallon jug container with about a 1.5″ diameter opening for the tomato plant. He cut out a rectangle on the side towards the bottom to fill in dirt (and also for watering) and later covered it with mesh. And lots of duct tape. It never produced quite as much as our in-ground tomato plants. The kids enjoyed picking tomatoes off of them though. Click here for a nicer looking inverted tomato plant.