Sap from a birch tree is a clear, slightly sweet liquid that is harvested in the early spring when the temperature begins to warm up. The sap flows through the tree's xylem and phloem tissues and can be collected by drilling a small hole into the trunk. Birch sap has a refreshing taste and is often consumed as a natural health drink due to its high nutrient content. In fantasy settings, birch sap may have magical properties, such as being used in spells or potions related to healing or purification. The sap may also be considered a valuable commodity due to its rarity or unique properties, and may be sought after by alchemists or other magic users.