The maples have been pitifull at best and my birch haven't even started yet. But the birch usualy only starts when the maple are done. Ive got my fingers crossed but I think this year I might need to blend maple with birch in order to have enough sap to brew with. The flavours from the birch sap seem to lend more flavour than the maple sap. But either way it's a fun once a year experiment.