I think I am giving up on hop rhizomes I planted 6 only three came up and they are only 5 inches tall and won't grow any more and then I got 3 more hop rhizomes and they didn't come up either.
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patience! what was your procedure for planting? did you fertilize? how long in the ground? one of mine took almost 4 weeks to come up at all. several of mine were only 8 inches tall until I started watering daily then they took off. still alot of growing season left man. and remember the first year is all about getting established.
my talles one just went from about 10 inches tall to about 7 feet in less than 2 weeks also, so don't count those little guys out yet. if they are green they are growing.
but I would give them a nice 6 inch mulch of compost, leave a little space between the mulch and the actual bine, or area where the bine is going to come out.