Which plants are of type "weed" in the Garden?
Solution 1:
The Wiki doesn't have a subsection dedicated to weeds but it does have a section dedicated to Fungi, meaning that there is not enough weeds in the game to put into a list.
According to this reddit post:
Currently there is only one type of weed: Meddleweed
So the Wood Chips effect is only referencing Meddleweed.