What should I do if my magic mushroom grow kit shows signs of contamination?

The easiest way to detect signs of contamination is by observing the colour of the mycelium in your substrate. Yellow or brown mycelium could indicate bacterial contamination, while green, pink, and black are all types of mould. Unfortunately, given the size of the grow kit, you’ll need to carefully dispose of it and clean any surfaces and/or equipment before preparing another.