With little guys like that, would you leave them all together in one pot, or separate them, Drew? There must be 8 or 9 plants in that little clump. That may be why they didn't get larger this summer.
I'd think before they grow into gigantic sails, you'd want to give 'em some room. Next spring? Plant each one a couple of feet apart at least?
I keep mine in pots, and I'd give each of those little pups a huge pot of its own.
