I have bought what landscapers have called the worst tree possible. The Leyland cypress. That being said, I have 40 of them, mostly healthy and big so far. I would like to keep them as long as possible, as they are perfect as a windbreak and privacy screen. Would it be worth the time and money to start adding fertilizer and/or pesticides? If so, what would you suggest? I know you're thinking cut them down, that costs about 4k. I'm retired and pretty broke.