Fertilizer
Fertilizer is a substance used to optionally catalyze plant growth. Vegetables will grow bigger, flowers will grow more buds, and trees and bushes will grow more branches.
Fertilizer comes in a multitude of colors, with every plant requiring a different kind of fertilizer. Every plant will grow with the use of Special Mix Fertilizer or Cocoadile tears.
In the original game, colored fertilizers can be bought at Costolot's Store, while Ivor Bargain sells his own Special Mix fertilizer. Fertilizer is largely the same in TiP, but since Ivor Bargain's store no longer exists, his Special Mix is now available at Lottie's for a higher price. In Pocket Paradise, fertilizer is not buyable, and therefore must be obtained from Taffly poop.