Hi, I have a 30 foot row of mostly raspberries and a couple marionberries. There's a 2-ft space between them and the fence that gets part sun. I'd like to plant something in that space to help control weeds and add some greenery, but I don't want it to become invasive or compete too much for nutrients with the berries. Any suggestions? I'd prefer OR (or maybe CA or WA) natives, but am open to other options. Thank you!