The Growth elixir was a concoction made by Phineas and Ferb to make Baljeet's watermelon grow bigger for the Biggest Watermelon Contest at the Midsummer's Festival. Candace also used it to make herself two inches taller to become a candidate as the next Flawless Girl. This would backfire on her, as the elixir eventually made her 50 feet tall. Phineas mentioned that the elixir only works in one drop; putting more than one drop won't make the object or person grow past two inches. He later used it again to make their Aqua Primates grow. ("Attack of the 50 Foot Sister", "Phineas and Ferb Hawaiian Vacation")