Growing tomato plants upside down in a planter is simpler than cultivating them right side up in the garden. There is no need to stake a tomato plant that hangs from a planter; the vine grows freely, unimpeded by gravity. To hang tomato plants in a planter, you'll need a sturdy tree limb or a well anchored plant hanger to support the weight. You can also make your own hanging tomato planter from a bucket or pail.
Drill a 1/8-inch hole through the planter, 1 inch below the top rim. Drill a matching hole on the opposite side of the planter so that the holes line up with each other. Make sure to use the appropriate drill bit for the type of planter you are using. Use ceramic or carbide drill bits for terra cotta, glass or ceramic planters.
Drill a 2-inch hole in the center of the base of the planter. Remember to use the appropriate drill bit for the material.
Cut two 6-inch strands of 20-gauge craft wire.
Thread one wire halfway through one of the 1/8-inch holes. Twist the ends of the wire together securely to form a loop on the side of the planter. Repeat this step to make and attach a wire loop to the opposite side of the planter.
Cut a length of nylon cord twice as long as the desired length of the tomato plant hanger. Tie one end of the cord in a secure knot around one wire loop on the planter. Tie the other end of the cord in a secure knot around the other wire loop. Hang the planter from a tree limb using an S hook or from a shepherd's hook.
Insert the tomato plant's roots into the 2-inch hole at the base of the planter. Fit a coffee filter around the roots inside the planter. The coffee filter will help keep the soil inside the planter. Keep the tomato plant straight as it hangs on the outside of the planter. It helps to have another pair of hands for this part of the planting process.
Fill the hanging planter with potting soil to within 3 inches of the rim. Water the newly planted tomato plant.