For a more subtle lavender flavor, let the buds steep for a shorter period of time.
Bring water and sugar to a boil in a large saucepan, stirring until sugar dissolves. Add lavender; remove from heat. Let stand for 30 minutes. Strain. Return to pan, and boil until reduced by half, about 5 minutes. Let cool completely. Fill each of 6 glasses with 3/4 cup sparkling water. Stir 1/4 cup syrup into each.
