Trustyrusty said:Yes I think you could be right, thanks
One of the hops, has been the same size for a month, came up out of the ground (or soil I mean) and saw the bad news and has gone to sleep
From what I've read, hops tend to shoot out and establish themselves for about a week (to the point where yours look like they're at) and then don't grow much for about 3 weeks, and then grow like crazy all of a sudden. That almost lines up with what you've said is happening.
In my first year of growing that's, more or less, what has happened for me. So I wouldn't worry too much. I used commercial soil mix (then added a bit of slow-release fertiliser) and I doubt that potting mix is going to be a problem for a plant that is extremely difficult to stuff up growing.
I planted 18 in proper ground and 1 in a pot. The potted one was planted a week after the other, yet it is now well ahead of the others. My pot is quite a bit bigger than yours though (about double the size).
EDIT: I also gave it some seasol every couple of weeks, as well as adding the slow-release fertiliser that I'd mentioned. The potted plant is getting full sun, loads of breeze. It's now waist-height. The other ones (in the ground) are mostly still under 10cm.