Strawberry-Cucumber Gin-Elderflower Spritz

Muddle sliced strawberries, halved cucumber slices, sugar, and lemon juice in the bottom of a pitcher until fruits break down and release most of their juices and sugar has dissolved. Stir in gin and St-Germain to combine. Fill 6 glasses halfway with ice. Divide fruit-and-gin mixture evenly among glasses. Top each with 1 to 2 ounces club soda; stir once. Top each with a few dashes of bitters, whole strawberries, and cucumber rounds; serve immediately.