AllEmailDeletedImmediately wrote:

if you know it's there and don't report it, you're an accessory and may
be charged as such should the police find it and can tell that you could
see it. it may not even matter if you told them you had no idea what
pot looked like.

If there's a medical mariujuana law in the jurisdiction, the
fact that they are growing it may be perfectly legal. (However
placing the plants where minors might easily access them
would probably run afoul of some law or another.)

Steve