Never assume the best for them...

If they've found out the location and plants, you have to assume everything is corrupt now. I'd personally move them to another spot, preferably a better hidden one. If it's teenagers, than they would have already stole them, or they're waiting, like you stated. Either way, it's not looking good for you guys.

If it isn't teenagers... Well, it's looking worse. If they haven't took them yet, they're waiting either to bust someone, or to take them when they're mature enough...

Anyways, good luck, all the best.
-Lay