I read the Norwegian article that was linked, and it isn't actually similar: you would only have to pay taxes on food you've grown on your balcony (and mean to consume yourself) if you are a farmer, are growing it during regular working hours, and have an insanely huge balcony.
Another thing that makes home construction a bit different in this regard is that you could claim to build a house for yourself, live in it for a bit, and then sell it on a couple of years later. That'd be an easy way to avoid or evade taxes. Not so easy with lettuce -- once you've eaten it, you've eaten it.
