This is my first season growing hops, and it's off to a slow start. My rhizome put out one shoot, which grew to about an inch tall, then pinched off at the base. It continued to grow for a little while, but then dried up and died. A new shoot was just coming up at the time, but now it's done the same thing, pinched at the base. I can't see any insects that might be doing it. I've pretty much written this season off as unsuccessful, but I don't want to repeat the same problems next year. Any thoughts? Thanks!