The main concerns in spacing hops are tangling the bines as they grow, the sidearms can run 2-4 feet and being certain what comes up next year is what you planted. A very vigorous hop could put out roots into another plant's territory and take over the space. (My Fuggle & Cascades are real pains) Many home growers will cut around each plant in early sprint (about 1-2 feet out) & remove the extra roots. A really great idea is to sink a bottomless 5 gallon bucket around each plant to act as a barrier.
Most of the pros that drip irrigate have gone to a 3x14 spacing. Less hose and more working room between rows. They don't have to worry about mixing, as they never grow two varieties in the same field. Others use a 7x7 spacing.
I haven't seen anything on the dwarfs, yet.
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