Birch sap collection is done by tying a bottle to the tree, drilling a hole into its trunk and leading the sap to the bottle by a plastic tube. A small birch (trunk diameter about 15 cm) can produce up to 5 liters of sap per day, a larger tree (diameter 30 cm) up to 15 liters per day. Birch sap has to be collected in early Spring before any green leaves have appeared, as in late Spring it becomes bitter. The collection period is only about a month per year.
.The price of birch sap is correspondingly high in some countries, e.g. in Japan reaching up to 50 Euro per liter.
. A traditional herbal medicine functioning as antiseptic, anti-parasitic, anti-inflammatory, and anti-itching treatment.
.Harvested in a similar manner as Maple Sap to create Maple Syrup only hiughly perishable. Shelf life can be prolonged by freezing or pasteurization. However pasteurization destroys some ingredients and can alter the taste of the product. Frozen birch sap is fairly stable.
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