Oyster mushroom (Pleurotus ostreatus) is a type of edible mushroom from the Basidiomycota group. To increase the growth of oyster mushroom production, one of them is by using coconut dregs and oil palm midrib powder as growing media for oyster mushrooms. This study aims to determine the effectiveness of coconut pulp and oil palm midrib powder as a planting medium for the growth of oyster mushro…