Vamp is a limited mutation in the Roblox game Grow a Garden, added during the Halloween Event update.
To obtain it, you need a specific weather event to trigger.
The game includes several other mutations that can boost the value of crops in your garden.
Overall, Vamp is a rare, event-exclusive mutation that greatly increases crop value when active.
In this article, we’ve explained how to get the Vamp Mutation in Grow a Garden, including its multiplier, appearance, and more.
Vamp Mutation Multiplier Grow a Garden Wiki

Vamp Mutation
Multiplier
x3
How to Get
During Bat Attack Weather Event
Description
Blood red fog emits from the targeted plant.
This mutation gives a 3x multiplier to the crops it’s applied to, meaning the selling value triples.
It activates during the Bat Attack weather event and affects fully grown crops.
Visually, the mutated crop emits a blood-red fog, making it stand out.
While its multiplier is lower than some other special mutations, Vamp remains valuable because of its rarity and event-exclusive nature.