Specialty Gardening: Pansy Pyramid, 1 by DarkEmerald

DarkEmerald wrote:
This is such a great idea, ladyrowan! How cute would it be with trailing plants added?

I'm thinking about how to stabilize it. I'd be inclined to tie the bottom row together--a plywood "collar" seems like a simple way to do that. Then, borrowing from the equally wonderful stacked-container idea posted by Coco (http://davesgarden.com/t/423335/), maybe run threaded rod up from the plywood through each of the three pots in the second row. I've dummied up a drawing--any use at all?