Any hope for my 40 year old Cypress?

My garden is flanked by a number of evergreens, including Leylandii an
Cypress, which were planted back in the 60s.
Last year one of our Leylandii completely died. We had it cut out, b the guy who trims them each year.
I'm now really concerned as the same seems to be happening to my 20f Cypress and, to a lesser extent, to my 35ft Cypress planted a few fee from the stump of the Leylandii.
Is there anything I can do to save them, they're considerably mor attractive than the neighbours!!
Any help would be gratefully received.
Cheer
-- Fartcat
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First thing to do is figure out why they're looking bad... insects, disease, root compaction, climate, soil moisture...
The second thing to know is that by the time most folks notice a tree is looking bad, it's been in trouble for at least a year or two. Sometimes, particularly with insect infestations or drought, they can be saved with prompt action. Sometimes it's just not possible.
As an example the city I grew up in decided to widen a street, and "saved" a number of nice oaks by building smallish retaining walls around the rootball about halfway out from the crown on the street side and in the process, changing the soil level around the trees, and then chopped the roots that were where they would protrude into a road bed. Oaks are pretty unhappy about having their roots damaged, or even disturbed. Took about 10 years for the trees to die, and the city spent a lot of money trying to save them -- they really would have been better off simply removing the trees to begin with and planting something new. Or deciding they really didn't need a 6 lane city street. But those trees were basically goners as soon as the first bulldozer went by.
Kay
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Kay Lancaster;743344 Wrote:

Thanks for the extensive advice guys. The Leylandii that died jus went brown, there was no evidence of insect infestation. The same i happening with the Cypress.
I have fouund that there is a big hole in the ground next to one of th Leylandii, like something rather large has been burrowing, so I'm a bi concerned that this is root related. I'm no gardener, so I'm not sur whether to fill this hole and if so what with.
I guess I'm resigned to the fact that we'll probably lose them, bu don't just want to sit back and watch them die if there's something could do.
Thanks for your help
-- Fartcat
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