Add the Pinot Grigio, lavender syrup, liqueur, lemon slices, grapes, blueberries, and lavender sprigs to a large pitcher.
Stir gently and taste; adjust sweetness or acidity as needed.
Cover and refrigerate 12–24 hours to allow fruit and florals to infuse.
Remove lavender and lemon slices if storing beyond 24 hours.
Add seltzer just before serving to keep the bubbles lively.
Serve in an ice-filled wine glass, spooning fruit into each glass.
Garnish with a fresh lavender sprig or edible flowers.
Notes
**Lavender Simple Syrup
1 cup sugar
1 cup water
2 tablespoons dried culinary lavender
Boil the water and add the lavender to it to make tea. Let it steep for at least 10 minutes, or longer if you want more lavender flavor. Strain the lavender out, and combine the warm tea with the sugar until the sugar has dissolved. Store in the fridge.