Upside-down tomatoes are found in many container gardens. The plants, which really do grow upside down through holes in the base of a 5 gallon plastic container, seem to thrive due to the amount of water that the roots receive. Additionally, tomatoes grown in hanging buckets are more resistant to diseases found in soil, and the fruit is easy to harvest.
Turn a 5-gallon bucket onto its lid.
Cut a hole in the bucket's bottom using a saw-toothed forstner bit and a drill.
Cover the hole with a coffee filter.
Turn the bucket back over onto its base.
Fill the bucket with potting soil.
Place the lid securely on the bucket and turn it back onto the lid.
Cut a criss-cross into the coffee filter with a utility knife. Scoop out soil with a garden trowel. Place the rootball and stem of the tomato plant into the soil to a depth that puts the bottom leaves level with the hole in the bucket.
Fill in the soil around the stem. Water well.
Continue to water the plant and allow roots to develop in the plant in the bucket.
Hang the bucket in an upright position when the plant reaches 1 foot tall. The plant will now be hanging upside-down.
Water the plant by removing the bucket's lid and pouring water from a watering can into the bucket. Feed the plant by adding a few drops of balanced (10-10-10) fertilizer into the watering can before you water.