We only have 5 acres, but we a little over three of it is alfalfa. One of our neighbors/friend cuts and harvest it a couple times per year. When we moved here there were very few milkweed plants. Little by little we have a lot more growing now. We see more Monarch Butterflies now. We also have planted many flowering plants to attract bees. My wife maintains several Humming Bird feeders. Damn. those little guys are quick!