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Bushes grow in clusters of five, although sometimes multiple clusters can be found in an area. Each bush has a set regeneration rate. One cluster of bushes can keep up with a fully staffed gathering camp placed right next to it. However two huts will overwhelm it and it will spend part of the time bare of berries, wasting your forager's time.
Some research indicates 5 bushes provides 190-200 berries per month, and so can sustain 45-47 villagers