My condo has a lawn out front, which belongs to the condo. Recently, I've noticed this man coming and poking around in the rose bushes quite often, like once every few days. My sister asked him what he was doing, and he told her he was trying to cross-breed roses. Is it okay for him to be poking around on private property? He's not exactly doing anything harmful, but then again, it's not really a public park. Should I say something to him?