I tried growing tomatoes upside down and the water ran right through the container without actually soaking the root ball. I'm not sure what I need to add to the potting soil to allow the water to soak in well before running out the bottom. Maybe I should add some clay to the potting soil? Any thoughts?
Soil for Upside Down Gardening
Certified GKH Gardening Expert
Well-draining potting soil amended with compost is usually preferred. Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/special/containers/upside-down-gardening.htm