My 50-60 year old tree, Leyland cypress is turning very brown over the last couple of years. My lawn can get very waterlogged when it rains heavily so, it can’t have dried out. Also, I have planted a few eucalyptus trees in the last couple of years nearby, and they are growing well. I have noticed a lot of ivy growing on the main trunk of the leyland cypress.How can I get this tree back to it’s green glory?