Do I remove the material from the bag?

Grow kits should stay in the bag while they grow. After removing the box cut an X into the exposed plastic about 3-4 inches long cuts. Enough oxygen gets to the block through this cut and it directs the mushrooms to form there. Remember to leave the plastic flaps of the X on the bag, they'll help to keep moisture in. The mushrooms will easily grow out of the sliced X section, so no need to open it up more as they fruit.