Fertilizer () was a limited time currency during the Terwilligers 2015 Event. It was earned in different ways:
- By tapping on Mutant Vegetables (Act One) and Bob Clones (Act Two and Three) that appeared on the streets of the Player's Springfield.
- By tapping on Mutant Seeds that appeared on the player's town.
- By completing Cecil's Daily Tasks
- By completing event-related jobs at the Monsarno Research.
Fertilizer was used to Upgrade the Monsarno Research and to Craft prizes available at the same place.
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