"Nor do we insure loss or damage arising directly or indirectly from the growing, cultivating, harvesting, processing, manufacturing, distribution or sale of any drug or narcotic or illegal susbstance, whether or not "you" have knowledge of such activity. This includes any alterations of the "premises" to facilitate such activity."
This statement seems pretty clear to me. I don't think that vegetables are defined as "any drug or narcotic". Good luck on your argument if you should ever have a house fire. The fire would not have to have anything to do with your grow - but having evidence of a grow is enough to void your house insurance. No ifs, ands or buts about it. And as soon as your insurance is cancelled, your mortgage will be called by the lender. And you are fucked.