Um, having eaten many a blackberry and oranges in my day, there isn't enough plant vegetation conveniently available. Not without intentionally cultivating it. A large animal, dried, much more fits the bill. Unless we all ate grass. THAT is very available.
What's in your backyard? I still have lots of blackberry bushes and a couple of blueberry bushes. I have a grapefruit tree growing. But, it won't bear fruit for at least five years. Otherwise, I have pine and oak trees. I do have mock cherry trees, but you can't eat those. And grass and moss. We cleared this lot, it had grown wild for a number of years. I did have some passion plants show up in my pasture. Not enough to live on.
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much wider variety of plants
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Maybe it's just Florida, but there ain't a wide variety of plants here. ie, wild, edible. There's LOTS of ornamental plants.
Edit again. And prickly pear. I've eaten a number of those too! I have a couple in my yard.
Edit again: I would also assume the fruit eating was seasonal. My grandmother had an orange grove. You only had fruit certain times of the year. And I don't think paleo man could can his fruit.
Vegetarian: Indian word for bad hunter....(I need to get this tee shirt!)