The foundation of Barrell Craft Spirits Gray Label Seagrass began with two groups of 16-year-old 100% Canadian Rye barrels - one with bright citrus and crisp green apple notes and the other with earthy spearmint notes. A portion of the first group was finished in Apricot Brandy casks, a portion of the second group was finished in Martinique rhum barrels, and a blend of the first and second groups was finished in Malmsey Madeira barrels.nbsp; When each set of secondary maturation flavors peaked, those casks were pulled and slowly married into the final blend.