What pH level do most molds prefer for optimal growth?

Most molds thrive in acidic to neutral pH environments, typically preferring a pH level that is less than 7. This preference is largely due to the fact that many molds have evolved to grow best in conditions that are slightly acidic, which can be found in organic materials such as soil, fruits, and decaying plant matter.

Acidic environments can enhance the availability of certain nutrients that molds require for growth and can also inhibit the competition from bacteria, which may not thrive as well in lower pH conditions. Hence, the optimal pH range for most molds is indeed below 7, supporting their growth and reproduction.