I have to be honest, unless it was definately someone's ground and they'd be unhappy I'd have a pick. If it's Uni ground, I'd probably not think twice. I pick loads round by us in our back alleys etc but am careful not to pick them too low down incase they've been used as a toilet by local dogs

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"There are only two lasting bequests we can hope to give our children; one of these is roots, the other wings" - Hodding Carter