I have 8 varieties of hops in my garden. Seven of them seem to send out shoots close to the crown, but not my Tettnanger. It wants to send shoots in every direction oftentimes travelling a foot or two before coming out in the grass. Anyone else have this problem with Tettnanger? I seem to have to chop roots with a shovel to keep it at bay a lot more than the other varieties. It wants to keep visiting the other varieties each side of it. Any suggestions on taming this beast? Thanks.