DNR will wait for you to come harvest and bust you then, or follow you back home and bust you there. They set up motion-detector cameras in the vicinity too, so keep an eye out for shit tied to trees, and never take the same path to the greenhouse so you don't beat a path. You should only go to set up, then to harvest. Don't spend every weekend at the fucking place. Most outdoor growers will only plant 4 plants in any one place so it looks small time. You end up with more chances to get picked up going to multiple harvests though.
I've heard stories about endangered animals with tags unintentionally leading scientist-types to grows, who then alerted authorities, who then waited for the poor guy to come harvest.
Its just easier to grow inside!