Glowing Mushroom Biome Guide: Truffle, Glowing Mushrooms (1.4.5)

How Terraria's Glowing Mushroom biome works — the underground fungus fields, how to build a surface mushroom biome that attracts the Truffle, and what glows there.

10/5/2026 1.4.5.8 Terraria Wiki Team 3 min read

FAQ

How do you make a surface mushroom biome in Terraria?

Lay down at least 100 tiles of mud, plant Mushroom Grass Seeds (dropped by chopping underground mushroom grass), and let the blue grass spread across the mud. Build a valid house on it and the Truffle can move in during Hardmode.

Where do you find the Glowing Mushroom biome underground?

Natural mushroom fields generate in the Underground and Cavern layers — look for the electric-blue glow and giant mushroom trees on the map. They're common enough that most worlds have several within a short dig of the surface.

Does the mushroom biome spread like Corruption?

Mushroom grass spreads across mud but it is not infectious in the evil-biome sense — it never converts stone, sand, or NPC housing, and it cannot be converted by Corruption or Crimson. It's one of the safest biomes to build next to.

What does the Truffle sell?

The Truffle sells mushroom-themed gear: the Autohammer (crafts Shroomite bars for ranger endgame armor), the Mushroom Spear, Mushroom Cap vanity, Strange Glowing Mushroom for the Baby Truffle pet, and the Mushroom Pylon — among the best late-game NPC shops.

Why won't my Truffle move in?

Three common causes: the world isn't in Hardmode yet, the house isn't on surface mushroom grass (underground mushroom fields don't count), or the house fails the normal validity check — needs walls, a door, a table, chair, and light.

What is the Glowing Mushroom biome?

The Glowing Mushroom is Terraria’s luminous blue fungus biome — fields of mushroom grass growing on mud, giant glowing mushroom trees, and ambient enemies like Fungi Bulbs and Spore Bats. It exists in two forms that matter differently:

Underground fields — natural pockets in the Underground and Cavern layers, available from world start. These are your source of Glowing Mushrooms (food-tier healing, potion ingredient) and Mushroom Grass Seeds.
Surface mushroom biome — a player-made biome on the surface. This is the version that matters in Hardmode, because it’s the only place the Truffle NPC will live.

Glowing Mushroom grass never converts to Corruption, Crimson, or Hallow — it’s one of the few biomes that’s immune to infection, which makes it a surprisingly good quarantine wall.

How do you build a surface mushroom biome?

Gather Mushroom Grass Seeds by cutting grass in an underground mushroom field (each stalk has a chance to drop seeds) — or buy them from the Dryad while she stands in a mushroom biome.
On the surface, lay a pad of mud and plant the seeds — the biome registers once 100 mushroom-related tiles (mushroom grass plus plants) exist. The blue grass spreads across mud on its own — give it a few in-game days.
Once the background shifts to the mushroom biome and the music changes, build a valid house (walls, door, table, chair, light) on or near the grass.
In Hardmode, the Truffle will claim the house and open his shop.

The same process works underground to expand natural fields — useful for farming glowing mushrooms or Glowing Mushroom Seeds without touching the surface.

What does the Truffle sell — and why it matters

The Truffle is the payoff. His shop includes the Autohammer, the only crafting station that turns Chlorophyte Bars into Shroomite Bars — the material for Shroomite armor, the premier endgame ranger set before luminite gear. He also sells the Mushroom Spear (a strong pre-Plantera melee polearm), the Strange Glowing Mushroom (summons the Baby Truffle pet), Mushroom Cap vanity, and the Mushroom Pylon — one of the eleven pylons that power the teleport network.

Because his shop is mostly late-game material, the usual play is to build one small surface mushroom biome specifically to house him — our NPC unlock guide covers the full town roster, and NPC happiness explains why housing him with the right neighbors drops his prices.

Underground farming tips

Glowing Mushrooms regrow on mushroom grass automatically — a small dedicated mud farm in the Cavern layer gives unlimited healing pickups and alchemy stock.
The underground mushroom biome also grows Giant Glowing Mushrooms (the tree-like stalks) that drop mushroom wood — a free building material with a unique blue look.
Mushroom fields are peaceful by Terraria standards: no infection, no evil enemies, and surface fields stay calm until Hardmode adds Truffle-themed wildlife like the Fungo Fish for anglers.

Screenshot sources: cover and gallery — official Steam store screenshots (Re-Logic).