Sewant mushrooms are used to craft the following items:

Sewant mushrooms
Tw3 sewant mushrooms.png

Used in alchemy
Description
Inventory/slot
Alchemy and crafting
Category
Common item
Type
Alchemy ingredient
Source
Tw3 herbs.svg Grows wild
Base price
Tw3 icon crowns.svg
Price to buy
9 – 10  Tw3 icon crowns.svg
Price to sell
Tw3 icon crowns.svg
Weight
0 Tw3 icon weight.svg

In The Witcher computer game

Sewant mushroom
Substances Sewants.png

Sewant mushroom
Description
Type
Herb
Contains
Substances Small Vitriol.png Substances Small Rubedo.png
Source
grows in crypts and caves
Price to buy
9 Items Oren.png
Price to sell
1 Items Oren.png
ID
it_ingr_071

Sewants are large grey mushrooms growing in caves (quite possibly every single cave and several crypts in the game).

Sources

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