Comments Update: The shed came with its own flowerboxes, and we didn't make the ones on the fence (but I did paint them that bright green! ha ha)... I bought them at The Christmas Tree Shops last year. I was just there the other night and they have them this year, too. My husband screwed the windows and the planter boxes into the cross rails/support rails of our "oh so old" stockade fence and they seem to be holding really good!