Brits have been told that they could face fines of up to £300, regardless of the amount that you've gathered. I fell behind on picking blackberries, they got overripe & overrun with wasps/flies…But to my surprise, I came across a gorgeous Mourning Cloak also enjoying the sweet taste of the berries! What are the rules around picking blackberries? Anyone is allowed to forage blackberries for personal use, provided they don’t uproot the plant. That means gathering blackberries from hedgerows and commons is generally legal, as long as they’re not sold for profit.