Mutations are special effects added to crops and are a key part of Grow a Garden.
They mainly help by boosting the crop’s value, allowing players to earn more Sheckles and profit.
The game features many types of mutations, such as Meteoric, Old Amber, and Voidtouched, which random weather events, specific pets, or gear can trigger.
To calculate the value of a mutated crop, the following formula is used:
Total Price = Fruit Constant × Mass² × Growth Mutation × (1 + ∑Mutations − Number of Mutations)
This article covers how to get Old Amber Mutation in Grow a Garden, along with its multiplier, effects, and more.
OldAmber Mutation Multiplier Grow a Garden Wiki

OldAmber Mutation
Multiplier
x20
How to Get
After 24 hours, the Amber mutation changes into OldAmber.
Can’t exist with Amber or Ancient Amber after 24 hours.
Description
Looks more orange compared to the yellow version before it.
The OldAmber Mutation gives a x20 multiplier to the crop.
When a crop stays in the Amber mutation for 24 hours, it will automatically change into the OldAmber mutation.
However, once a crop has turned into OldAmber, it can no longer return to its previous Amber or Ancient Amber state.
Visually, crops with the OldAmber mutation appear more orange compared to their earlier yellow look.