I would expect any tree of that size to have a certain level of stress from being planted out. I take it they were potted trees and had good root systems when they were planted? and you've kept them well watered since they went in? The struggling one does seem to be very exposed so I suspect weather damage will be the most likely cause. The rest don't seem too bad for such newly planted trees, especially ones so close to mature trees.
What is on the other side of the boundary? Is there any chance of weed killers or chemicals being used by the neighbours?
If you can keep your head, while those around you are losing theirs, you may not have grasped the seriousness of the situation.
They were delivered and planted by the owner of the garden centre we bought them from so we didnt see them being planted as we were at work, they were in pots and had just been delivered from Italy. The struggling one is in a part of the garden where it gets most wind and has taken a thrashing this year, its just the bottom of the stem thats bothering me it looks like it could open up and dry out and could stop the water doing its job. The trees were bought due to the houses that have been built at the back of us last year, there is our fence then a metre gap then the neighbours fence. They havnt done anything since they moved in they dont seem to be gardeners , cutting the grass is a major chore. I think i shoild contact the garden centre where we got them from as he should know, thanks for your help at least j know the spiders arnt a hazard to them now.
The problem with pleaching shrubs that size, they will always struggle to adapt to your surroundings and soil. They are all quite mature shrubs, and it's going to take them a while to settle in. It's always better to grow the shrubs small yourself and then shape them for pleaching whilst they grow.
Since they are in now, you must water generously throughout the summer months. At least 2 buckets for each plant. Think about laying a thick layer of mulch like bark chip as that will help to conserve water and keep your shrubs cool. Some are planted so close to tree roots, they may suffer more, so keep an eye on those particular shrubs with extra more watering.
The ones that are planted near the mature trees are growing better than the other trees, i think its the wind that is the problem at the other side of the garden as there is no rotection for them from the wind. We are currently watering alternate nights with the hose
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Since they are in now, you must water generously throughout the summer months. At least 2 buckets for each plant. Think about laying a thick layer of mulch like bark chip as that will help to conserve water and keep your shrubs cool. Some are planted so close to tree roots, they may suffer more, so keep an eye on those particular shrubs with extra more watering.