You need to cut the stems down each year when the season is over so that you can harvest your berries w/o harm to yourself. They grow rapidly and every year you will have a new harvest. Putting eyescrews in a fence behind them is a way to keep them upright and easier to harvest. Of course you have to wait until the stems are long enough to tack up on the fence. If you don't tack them up they will root where they are when they are ready to root.