Is that corner getting enough sun?

That may cause thinning and discolouration

id say that and the others are probably taking over near them,.

thanks., they may be short of light , but do you think they may also be lacking in water, do leylandi need alot of water?

they just drink a lot especialy so close to each other in the corner and they need feeding.

thankyou, what do you recommend?

just a general purpous feeder realy but im no expert.it mite be worth asking that question on here or google it.the other thing you can do is bury a pipe or to so when you do feed the trees you know there getting it.

thanks thats really helpful.

your more than welcome thats what we all love this site for . youl be answering questions before you know it lol . take care bye for now .