Hollow Knight Silksong All Mister Mushroom Locations
Guess who's back again? The Mysterious Mushroom man himself from the original Hollow Knight version. If you've played this game in the past, then this mysterious NPC should not be a new character to you. Basically, what you're doing is hunting down mushrooms from several locations on the map and heading to a secret place where you move to the next campaign. If you're looking for how to find Mister Mushroom in Hollow Knight, you must have completed the Passing of the Age Ending quest. This guide exposes the different locations where these mushrooms grow. It also discusses several ways in which a player can converse with Mister Mushroom in Hollow Knight.
Spot-on Places to Find Mister Mushroom in Hollow Knight: Silksong (Passing of the Age Quest)

Make Your Own game Server
At the right corner of the map lies a hidden location. A player ought to visit this spot before embarking on the real quest involving our very own fungal friend. Past Fleatopia and across the lake are the Purified Ducts. Also in plain sight is a cave that you may need to enter. Before you do so, mount the wall nearby until you reach a little platform where light glows downward.
Entering the cave, a player can get the Craftmetal for the task. Then he may need to use his Silksoar ability to soar up to the top of the cave where beautiful mushrooms reside. One more thing the player has to do is head over to the tablet and read the inscription to kickstart the main quest. All these are mainly the unraveling of the poem. Below are locations to find our mysterious fungal friend:
Moss Grotto
Your first stop should be the Mosshome right at the Bone Bottom Bellway station. At the far left is where the Ruined Chapel is. Run over to this location, drop down, and head a little bit right. There you'll see blue mushrooms from the Fungal Wastes on the ground.
Play your Needolin to prompt Mister Mushroom and watch him dramatically rise from the ground. A little conversation with our fungal friend, and he's burrowing away.
Bone Bottom
Your next task would be visiting the little platform above Bone Bottom town. This time around, Mister Mushroom doesn't travel far. Converse with him as usual and he'll clear the path for you.
Far Fields
Onto the next location, now you're looking for a “Scorched Field,” which can only mean traveling to the Fairfields Bellway Station. Remember where you completed the Spine Quest a long time ago? If you don't, head down then move east along the Bellway Station. Mister Mushroom in Hollow Knight will mount on a platform just to the right of where you completed the horrendous volcano climbing quest. If necessary, use the image attached to verify the exact location.
Greymoor
To find Mister Mushroom in Hollow Knight, one must visit the scattered windmills around Greymoor. While this may seem a little tricky, it is easy to locate if you head to the Greymoor Bellway Station and navigate up through the tower directly above. Once there, head west and follow through the tunnel that runs up in the cave above. Speak with Mr Mushroom in this location and he'll move on. While traveling back, use your soar ability to navigate to a new area called the Wisp Thicket, a pretty small spot with a boss fight challenge that may have you bashing your head against the wall.

The Slab
The cages are next! Navigate to the Slab Bellway Station and locate a small spot you unlocked with the 3rd Slab Key. Every player has this key in their possession. However, if you don't find it, chances are that it is available in the Purified Ducts near the house with the Broodfeast Quest Giver. There you'll find the First Sinner who will also engage you in a fight that, once won you'll receive the Rune Rage Silk Skill as a reward. To find Mister Mushroom in Hollow Knight after this challenge, a player needs to complete the task in the paragraph above. Our fungal friend will appear left of the cage. Converse with him and he will vanish.
Mount Fay
Your next task would be climbing up Mount Fay, which is easier to mount now that you have the Faydown Cloak. Locate the wall that borders the slab at the far right of the area and make your way to the top without any platforming. Mr. Mushroom will be there chatting with the bug-bird.
The Cradle
All Mister Mushroom locations in Hollow Knight are quite straightforward, except the cradle, where you fought the Grandmother Silk. Part of this quest includes using the map to navigate to the cradle, binding the severed arm of the Grandmother Silk to acquire the Pale Nails Silk, double-jumping, pogoing, and grappling on the platforming section. Mr. Mushroom will be on a ledge without a map. Talk to him or play your Needolin and he will zoom in.

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FAQs
Where Can I Find Mister Mushroom in Hollow Knight Greymoor?
Our fungal friend will be right outside the tunnel that runs up in the cave above the tower at Greymoor Bellway Station.
How Do I Encounter Mister Mushroom Up in the Cradle?
Simply by navigating to the said location, binding the severed arm of Grandmother Silk to receive Pale Nails Skill, and jumping on the platforming section.
Where Can I Find the 3rd Slab Key?
Every player should own this by now. The 3rd Slab Key is however, available in the Purified Ducts near the house with the Broodfeast Quest Giver.
Which Tasks Require a Player to Have a Boss Fight Challenge?
Finding Mister Mushroom in Greymoor and The Slab will require a boss fight.
Conclusion
Now that you know how to find Mister Mushroom in Hollow Knight, ensure to gather the necessary skills and abilities before embarking on any journey. Also, keep a Needolin by your side.
All Mister Mushroom locations in Hollow Knight require completing a particular task or acquiring a skill. All in all, it all ends when you defeat the final boss of Act 3. If you like, check out our ending guides to get a clue about the other campaign conclusions.