This is a bathtub salvaged on the side of the road and converted into a grow box. There is a six inch water reservoir on the bottom and 9 pipes that wick the water throughout the tub. The soil is half composted horse manure with hay and wood shavings and half topsoil from composted mulch. I just planted it intensively with Mr. Stripey heirloom tomatos, poblano peppers, collards, thai basil, and an eggplant in the middle.