Summery Melon Sangria

SUMMERY MELON SANGRIA1 (750 milliliter) bottle of dry Rose’½ c. elderflower liqueur (such as St. Germain)2 mint sprigs, divided1 ½ c. (1”) cubed cantaloupe, divided1 ½ c. (1”) cubed honeydew melon, divided1 ½ c. (1”) cubed seedless watermelon, divided1 ½…