Clear, odorless liquid dripping from river birch branches in late winter? It's just sap—harmless and temporary. Maples and birches bleed heavily after late-winter pruning. Sapsuckers (woodpeckers) even tap shallow holes to drink the slightly sweet sap, with no harm to the tree.
The flow stops naturally as spring progresses. For a fun experiment, collect sap next February and boil it down like maple syrup—a gallon might yield half a cup of sweetener.
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