I hope no one minds me taking a slight detour in this thread..
I have two half-barrels set aside for wisterias.. I was just planning to line them with plastic and plant straight into them, but now I wonder whether it would be better just to get a slightly smaller plastic pot and put that inside, to keep the barrels in better condition? Also make it easier to re-pot when the barrels do deteriorate.
I have seen them do this on gardening shows with ceramic pots, and then just fill the gap in between with pebbles or mulch I think.
Any thoughts? Good idea or crazy idea?