As the hop has started growing the stems have fairly quickly reached the point where they need support.
There had been a satellite dish on the side of the house above where the hop planter is now so I was able to re-use a couple of the mounting points for that to put up a wood batten into which I had screwed four eyelets with long stems to hold them clear of the wall.
I also added four eyelets to the inside of the planter and then ran coir string between them using clove hitches to tie it off.
The coir string is good for climbers as it has a rough texture that gives them plenty to take hold of. Rather than the tendrils used by peas and beans the hop stems have very small hooks on the stems that feel almost like velcro and it’s these that hold them onto the strings.