This isn't even a tariffs issue... well, maybe not, anyway. The same thing happened in Germany at least.

Over here, the reason potatoes are literally being given out for free is that the potato harvest was so bountiful, the supply so high, that the price distributors and supermarkets pay for them was just not worth the effort for a lot of farms. We literally produced too many potatoes for Capitalism to handle. I heard onions were similarly high in supply, so they were literally sold as biomass for energy production.

Remember this when you see someone begging for food. We could feed them, but if we can't profit of it we won't.