果酒 can be placed inside a Cask to age from normal quality to silver, gold, and eventually iridium quality. Iridium quality doubles the base sell price of 果酒.
Wine takes the longest to age of any item in Casks. It takes 2 seasons of aging to go from basic wine to iridium quality wine.
Normal, silver, and gold quality 果酒 can be prematurely removed from a cask at any time by striking the cask with an Axe, Hoe, or Pickaxe. As of PC v1.11, striking a cask that is ready to harvest (with iridium quality 果酒) with an Axe or Pickaxe will crash the game.