If we ever got to the point where there was an EO put out about hoarding food, I might think that we'd already be under martial law. Now, how dutifully and to what extent they might enforce such a thing, could be open for debate.
I guess we could speculate whether the powers that be could even imagine that we would 'can/jar' our own food, since they're so far removed from reality. They might just only include 'store bought'. If food stuff's have been removed from their original packaging, it's possible they might not want it. It might also depend on what the authorities plan on doing with it. Are they going to redistribute it? Do they intend to destroy it?
My Granny used to hide canned foods every where, in the tool shed, under her bed, in the garage, in the barn etc. I knew it had something to do with the depression, but again, it was another question that I didn't ask any details about.