The chance of someone stubling in your backyard and finding your plants then taking all 6 is not happening. Sadly you talked about it and someone decided that they wanted it.

Live and learn; loose lips sink ships. This is why theres a website so you can talk about important shit to people who dont know where to come rip you off.
If you cant control you mouth then just lay land mines in proximity of your plants. Better luck in the future sir...