Ilex Crenta Cloud Tree
I bought an Ilex Crenata cloud pruned tree from a garden centre a couple of years ago from a local garden centre for £350 but over the last year it has been increasingly becoming bare of leaves in places. It is still in the original large plastic plant pot I bought it in and it sits on my south east facing patio in East Yorkshire. I don't know what is causing it to become like it. I have considered a caterpillar or vine weevil or a fungus perhaps or maybe it just needs re-potting but I have no clue. The leaves that are still on the tree are green with the odd dead brown/dried out leaves here and there. I cant see anything obvious causing this. I have used a vine weevil drench on it in the past just in case but it has made no difference, it is getting worse with time. Someone recently suggested I re-pot it in a larger pot but not too large, using ericaceous soil rather than a tree/shrub compost but is this advisable? Can anyone please tell what they think is causing this and what I need to do to save my lovely tree before it's too late? Oh I forgot to also mention someone suggested to try using sequestered iron but when I have looked at what that is used for it seems more suited to yellowing leaves from what I can tell.