It's not cheaper to grow your own if it's not really well managed, which requires time. It's far easier to buy groceries at a grocery store or walmart and have leisure time not spent processing food. And if you don't process what you grow, it's like throwing money and time away.
I have a few jars of maple syrup that cost me about $200 to make; I could have bought the same amount made the exact same way for about $60. Eventually it will be free though.
I thoroughly enjoy growing a lot of my family's food and I guess it does save money in some respect, but it is a lot of work for not much gain. I can't grow doritos either.
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