Just don't be like me. I waited far too long to get rid of the gopher, because I don't like trapping any animal in a kill-trap, and nothing else was effective. The gopher I caught was about three pounds, massive for a pocket gopher around here. It took out two apple trees, one peach, a crab-apple that moved here with me, and a maple tree. It almost killed another peach. It also destroyed all of my raspberries, two honeysuckle vines, and did some major damage to a half dozen rugosa rose bushes.
If you get a pocket gopher, deal with it immediately. When I did finally get a trap and set it, I caught the gopher within four hours, and have caught another since then within an hour of noticing that it had moved in.
I recommend getting a 'Cinch' gopher trap, and keeping it on hand just in case! Just dig down until the tunnel is open and exposed, set the trap, and stick the pincer end down into the hole. They don't like having a burrow exposed to the open air, so they'll come investigate it and set the trap off.