Good LUCK!! I hope you get the unusually large harvest I've read about. We planted in towers last year and also in the ground (which was mounded up). We saw about the same production in both places.
One was planted with kennebecs and one with red potatoes.
I watered consistently and fed them, adding dirt almost every 2 - 3 days until the top was constructed and filled. The towers looked nice and would make good planters for flowers, so it's not a waste of work constructing them. The dirt left at the end was used to fill low spots in the yard. It was a fun experiment!