From Stardew Valley Wiki
|Found in:||The Farm,|
- Weeds can be obtained by breaking the planted seed of a Big Mushroom with a tool. The weed can then be placed on the ground and harvested to obtain fiber. This weed is a bug, the player should not be able to obtain it, like the Artifact Spot. Gifting this weed is possible, but not recommended, since all villagers hate it.