Growing tomato plants upside down has a few advantages over regular growing. The fruit will never sit on the ground which causes it to rot. It will be also be less accessible to animals trying to eat your tomatoes. Upside down tomato plants are also interesting to watch grow and provide a conversation topic for people visiting.
Most growers use five gallon buckets. They already have a sturdy handle and come with a lid. It is also possible to use a plastic storage container that has a snug lid. Make sure your container is at least ten inches deep. If there is no place to tie sturdy rope to on your container for hanging it up you may need to drill holes in the handles. White and lighter colored containers work the best. A black container will get very hot in the direct sunlight.
The bottom of the container needs a hole of one inch across. Cut in half an inch from this hole in many places so that a growing plant stem can move the plastic but the dirt isn’t falling out during early growing. A finger sized hole can also be made in the bottom away from where the plant will be. This will be where you can check the moisture level in the soil near the roots to find out when its necessary to water. Additional small holes are useful for draining excess water.
Start the tomato seeds in small peat pots (right side up). When the plants are several inches tall its time to transplant. When you squish your soil in your hands it should hold a loose ball but still be able to break apart again. Add natural fertilizers into your soil right from the start so that it is no necessary to use fertilizer during the growing process. Some examples of organic fertilizers are seaweed, bone meal and compost. Do not use chemical fertilizers on your upside down tomato plant. The chemicals in the water will drain down onto the plant foliage. Organic fertilizers break down over time and continue to feed your plant throughout the growing process.
Place your upside down planter on supports to keep it off the ground. Put the tomato plant still in the peat pot down into the new planter. Work the leaves through the hole. Add soil on top of the peat pot until it is near the top of your container. Place the lid on the top.
Hang your upside down tomato plant where it will receive good light. Water the soil the first time carefully as very dry soil may want to leak out with the water. Lift the lid and water a little at a time until there is a small amount of water coming out of the drainage holes. The water amount in the soil is most important near the bottom as most of the roots will be there.