Not swearing at them
. For the first time ever, I've got a silver birch tree bleeding after cutting off a few annoying twigs. Never encountered this before in all my time gardening for a living. Tried applying some dry lime but it has just literally washed it off again. Anyone any ideas? Probably just the sap rising at a rate of knots with the sun shining but I'd hate to think I've damaged a lovely tree because of a few dangling twiglets

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