One of my Cypress Trees isn't growing

Hi all,
Last year I bought 4 Cypress Trees, they were about a metre tall when planted. They went in to a new border with brand new compost and some feed. They were fed last summer and once again since it started getting a little warmer (Miracle Gro All Purpose Liquid Plant Food)
Three of the four have grown to almost the height of the fence panels and I have moved these on to bigger bamboo canes but one hasn't moved at all. It is still the same height as when I first planted it. Does anyone have any ideas what could be going on? I have attached some images.
Thanks in advance!
Sophie







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Posts
Must admit l am puzzled !
They all look healthy enough. Personally, l would carefully dig it up and take a look at the roots. It's possible that for one reason or another they are still as they were in the pot, and haven't attempted to get into the soil. Did you "tease the roots" before planting, that is, break into the rootball? (Sorry if you already knew that
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I pulled it up yesterday to take a look and get some pictures. It doesn’t look like the root ball has developed very much. I dug down further to see if there was any thing getting in the way. There is a soak away that runs under but it’s really deep underground so I don’t think that would be in its way.
I’ve also relocated the plants around it to give it some more space.