Grow a Garden is one of the popular Roblox games featuring many types of mutations, and one of them is the Pestilent Mutation.
In this game, some mutations appear during specific weather events, while others are triggered by certain pets.
The Pestilent Mutation activates when specific pets are placed in your garden and the crops have fully grown.
It was first introduced during the second part of the Halloween Event update.
In this post, we’ve explained how to obtain the Pestilent Mutation in Grow a Garden, including its appearance, multiplier, and more.
Pestilent Mutation Multiplier Grow a Garden Wiki

Pestilent Mutation
Multiplier
x8
How to Get
Can be applied by the Hex Serpent pet
Description
Mutated crops have a faint plus symbol that floats above them.
This limited mutation gives fully grown crops an x8 multiplier.
Meaning any crop affected by it will have its selling value increased eight times.
The Hex Serpent pet can apply this mutation after consuming five single-harvest crops within the Hex Square cosmetic.
You’ll notice a faint plus symbol floating above any crop affected by the mutation.
Overall, having mutated crops in your garden can greatly boost your earnings and help you progress faster in the game.