My second year Hallertau and Centennials are starting to show some significant growth in the last couple of weeks (despite the rotten spring so far in Michigan). I've attached pics of both (Hallertau's are farther along). Should I be pruning any of these shoots? I know the first year you're supposed to let everything grow, but I'm not sure how much to let go during the second year. The tallest Hallertau bine is already a foot and a half off the ground. Thanks for any suggestions!