Harvest young branches of a willow tree, ideally first-year growth.
Remove and compost all of the leaves and cut the branches into 1-inch(2.5 cm) pieces
Fill a jar half full with branches and pour boiling water over the branches to fill the jar. Allow to steep overnight, strain the next day.
Soak new cuttings in willow water before rooting or use it to water cuttings. When rooting cuttings in water, dilute willow water to half-strength. Willow water can also be used to water seedlings. Store willow water in the refrigerator for up to 2 months.