in a medium, heavy-bottomed pot, combine 1 cup water with the sugar. Place over medium-high heat and bring mixture to a boil, stirring often to dissolve sugar. Reduce heat to medium-low and add the dried lavender. Stir and simmer for 1 minute. Turn off heat, cover, and allow lavender to steep and syrup to cool; 20 minutes.
Strain syrup and discard the lavender. Place strained syrup in the fridge to chill completely; around 30 minutes.
In a pitcher combine chilled, freshly squeezed lemon juice with the lavender simple syrup. Stir thoroughly to combine. Stir in the remaining 1 cup of cold, filtered water. Place in the fridge until cocktails are ready to be made.
When ready to serve, fill each glass with about 1/3 cup of sparkling wine. Top with 1/3 cup of the chilled lemon-lavender-ade. Garnish with a sprig of fresh lavender or a lemon slice. Serve immediately.