It's also entirely possible Jessica's mom was under the impression the financial situation was due entirely to the fencing business. All purely speculation, of course.
Oh, how I hope this is the case. ;( IIRC, he had 7 acres of property, pretty easy to hide stuff on. I'm thinking he must have had some sort of building on the site though to grow this stuff. It's freezing outside, pot wouldn't be growing now, so he must have had some sort of facility on premises to grow.