I planted my rhizomes in mid May. They took a while to start growing, but then they did very well. Now I am quite concerned about them. As you can see from the pics below, the leaves started turning brown, shriveling up and falling off.
I started applying Sevin spray and doubled up on the watering schedule. They've started to grow again, but the problem doesn't appear to be eliminated.
Any idea what is going on here?
The first pic is Liberty and the second pic is Willamette.