I found this on the web. I thought it was a great idea and wanted to pass it on. Here you have a very nice salad garden growing in rain gutters along a wall. I think you would have to punch holes in the raingutter for drainage but you could water the top and then it might self water the lower ones. This could also be placed on a fence or other solid or semi solid structure. I'm thinking about putting some on my lath house walls and the dog kennel inside wall. I saw another very good idea, use toilet paper as seed strips. Roll out single toilet paper and lightly brush with flour water mix, place your seeds at the proper distance on one side of the paper than fold over. Lay your toilet paper strip in your raingutter planter on some soil then cover. Water, and watch your garden grow. I'm going to try this and let you know.