While you can purchase planters designed to hang tomato plants upside down, making your own can save money and time and lets you customize the size. Growing tomatoes upside down protects the plants from diseases that pass through ground soil and from many common pests. It also makes it easier to harvest tomatoes and often makes the plant stronger.
Remove the label from the 2-liter bottle by soaking it in hot water and carefully peeling it away from the bottle.
Cut the bottom of the bottle off with a pair of heavy-duty scissors or a serrated knife.
Drill four holes, spaced equally apart, around the bottom of the bottle, at least an inch away from the edge. These are the holes you will use to hang the planter.
Cut four pieces of twine into equal lengths, about 36 inches long.
Run a piece of twine through each hole in the bottle, and tie the ends so they form a loop.
Cut a small X-shaped slit in the center of a coffee filter.
Turn the bottle over so the top, or spout, is at the bottom and place the coffee filter inside at the neck of the spout. The filter helps prevent soil from falling out of the spout.
Mix together equal amounts of soil and perlite.
Fill the bottle with the soil and perlite mixture, leaving about 2 inches of open space at the top.
Gently push the roots of the tomato plant into the spout of the bottle and through the slit in the coffee filter. You may need to hold the bottle horizontally and use one hand to move the dirt first away from the spout, and then back to it to cover the roots of the tomato plant after they are inserted.
Hang the bottle with the tomato plant from a sturdy hook and water thoroughly.