Tonka beans are tiny, shriveled, black seeds from the Tonka tree found in Central and South America. Their slightly sweet, vanillic, and smoky hay scent adds a spicy, gourmand edge to a fragrance. Tonka beans work best in spicy and sweet scents featuring similar notes: clove, vanilla, heliotrope, bitter almonds, labdanum, cinnamon, etc. Their vanilla and hay-like scent is ideal for fall or winter, but usually blends well enough to wear any time you need a little sweet, warm spice to liven up the citrus or wood notes in a fragrance.