I had designed something like this awhile back; however, I utilized PVC rather than recycled soda bottles. I also engineered the unit to be made for aeroponics. I found this picture on Pinterest (link to my profile here), but it’s associated link, no longer works. The vertical gardening technique is quite interesting and items are planted just like any other soil planter. So I will set out to make something like this in the spring as the area where I garden is rather small for the amount I really want.