You can grow more than one bine up twine. I do about 5-8(I plant 5 rhizomes/hill). And no, you don't have to grow it up twine. Heck, I allow it grab onto whatever it wants in the front yard(decor) and use twine in the back yard(mainly for harvest-purpose only). The only thing I have to watchout for is high volumes of pests in dense leaves.
Your hops will be fine.
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Primary-Vienna Lager
Tap-100% Chinook IIPA, Dry Stout on Nitro
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Hops
6th Year- Cascade, Chelan, Chinook, Willamette
4nd Year- Hallertauer Tradition
3rd Year- Galena, Hallertauer Tradition
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