I started growing my first batches of microgreens in my garage. However, because the garage was musty and had poor ventilation, mold growth was prevalent. I observed mold fuzz growing on my microgreens seedlings; this negatively impacted the smell of the microgreens, making it more difficult to grow them indoors. Overall, it made the microgreens not look appetizing. In combination with the odor it releases, the mold can also affect plant growth by consuming nutrients that the plants are using.
How to reduce mold growth?
Increase air circulation: This can be done by growing your microgreens in a room with air circulation (fans, open windows)
Reduce Overwatering: Excess water creates an environment that allows mold to thrive; therefore, reducing your watering may help reduce mold growth
Put them out in the sun: The UV rays from the sun kill mold spores, so put your plants in the sun (or any light that omits UV light that has the sun's bacteria-killing characteristics). I noticed significant results when I used this method.
Monitor the temperature---Mold thrives in humid conditions (77-86 degrees Fahrenheit)