S-P-IN stands for Small Plot Intensive farming or gardening. You can use land you already have whether it's in your backyard, a friend or relatives backyard, or you can even barter with your neighbor to use theirs. You can even implement the SPIN concept if you live in an apartment.
You can start with 500 sq ft and grow to 3,000 sq ft. Your crop quantity will grow too.
Want to learn more about SPIN? Visit the website at: SPINFarming.com