1. Question: If in terms of making a vow mushroom are included within things that grow from the ground then why don’t you make a “borei pri ha’adama”, the blessing you make over vegetables that grow from the ground?
Background:
A. The blessing you make on mushrooms is a “shehakol”.
B. Mushroom get nourishment from the air.
C. The understanding of a vow is based on how people talk.
Answer: The Ra”n explaining the Gemara in Nedarim daf 55b explains that because one sees mushroom scatter about throughout the ground then when one says he vows to not get any benefit from anything that grows on the ground then mushrooms are included but since the main way a mushroom grows is through nourishment from the air then the blessing when eating it is Shehakol since anything which does not grow from the ground gets that blessing.