I secure my grow as if there's a neon sign out front that reads "MMJ Grown Here!".
That being said, I just started in September, the ones who know are my grower friend who I obtained my original clones from, my buddy who threw down on initial expenses because I'll be supplying him with meds at cost regardless and.......... My nosey ass neighbor who smokes and could see materials and equipment entering the garage. So I have to assume he has ran his mouth to everyone, whether he has or not.
Exterior door and security screen door(with tabs welded and 2 padlocks on top of the existing door hardware. Cage welded over wall ac. Motion light wired to motor driven siren plus wireless home security system, phone alert no monitoring. Camera's and DVRs coming soon.
Even if you don't tell a soul you have to secure your spot if it's if value to you. Maybe some cholo or gangster or who the fuck ever lives down the street from you, sees you walking out of the hydro store product in hand, that is enough to spark suspicion. You may not have seen him see you walk out either.
Point being, secure your shit like there is a public service announcement broadcasting your grow location daily.