I Planted Leyland Cypress Trees Near Sprinkler Line

Q: I needed a fast screen so I bought two Leyland cypress trees.
Unfortunately, I discovered I planted them only 20″ from a sprinkler line,
which is 8″ deep. Do you think I can leave them? 

A: If this is a plastic water line, as most are, there should be no problem. A
tree root cannot tell there is water inside. To them a waterline that’s not
leaking is the same as a rock; roots will pass it by with no damage likely.