Sorry for the late post -- I think I have the information you are looking for. First NOT ALL potatoes are suited for "tower" growth. So the first question would be how deep are your bags; if the bags are deep enough to be considered a tower, then you need to cross check this with the variety of potato you are growing. Second: when you plant a piece of potato (seed potato) this is your LOWEST POINT. Generally, a potato plant will not produce/store and tubers (potatoes) BELOW the level of the seed potato. This is why people plant the seed potatoes, wait for the green leaves to come up, and mound soil, always leaving enough leaves sticking out to collect light. You'll also note at harvest, that the lowest potato seems to have rotted; this was your seed potato that grew the plant. We plant the seed potato shallow, so the leaves get to the sun sooner/easier and start collecting light; then we mound the soil so there is room for the potato plant to set its tubers (potatoes) -- this means, that you plant you seed potatoes at the bottom of the sack, covering them with several inches of soil, and as the potato plant grows, you add soil.... always try to leave plenty of leaves sticking out of the soil so the plant can collect sun. Hope this help. From the Eagle Creek site (about their tower potato mix): Not all types of potatoes are suited for container growing, typically fingerling and late season varieties yield best. Bellanita, Bintje, Amarosa & German Butterball are the 4 varieties in this package.

- Celeste Archer