Hazel is a type of wood used in the crafting of wands. The physical appearance of a hazel wand can vary depending on the individual piece of wood and the wandmaker's design. The wood itself is known for its connection to wisdom and divination in traditional folklore, a trait that is reflected in its magical properties. All detailed characteristics of hazel as a wand wood are derived from supplementary writings by J.K. Rowling and are not mentioned within the original seven novels.
According to Garrick Ollivander's notes, hazel is a sensitive wand wood that is highly attuned to its owner's emotional state. Its performance is deeply connected to the feelings of the witch or wizard who wields it. (Pottermore)
Due to its temperament, a hazel wand is best suited for a skillful and emotionally stable user. (Pottermore)
While no hazel wands are identified in the original novels, supplementary materials specify at least one prominent character who possesses one.
Hazel as a wand wood is not mentioned in the seven canonical *Harry Potter* novels and therefore plays no direct role in the main plot. Its properties, introduced later, serve to enrich the lore of wandmaking and provide deeper insight into the characters who own them, most notably Sybill Trelawney.