Which specific part of the block do mushrooms grow on?

You have the flexibility to choose where mushrooms will grow on the block. Mushrooms will develop where there is sufficient airflow, so you can start by tightly securing the colonized blocks and then make cuts or openings to encourage mushroom growth in those areas.

To maximize the formation of larger mushroom clusters instead of multiple smaller ones, it is recommended to limit the number of cuts made on the block. By making only one or two cuts, you allow the nutrients and energy to concentrate in those specific spots, resulting in the development of a larger bunch of mushrooms.

Here you can use rubber band, clips or tape to tighten blocks and remove air bubbles, giving you the flexibility to choose where you want your mushrooms to fruit.

Shiitake is the only mushroom type where you take the bag off completely.