One quote from Sylvia Plath's "Mushrooms" that might help you is:
Our kind multiplies: We shall by morning
Inherit the earth.
The words "Our kind" have broad meaning. Literally, of course, they refer to mushrooms, mushrooms that grow as the poem describes. But figuratively, they apply to others that grow quietly but powerfully as mushrooms do. Due to the images of fertility and of domestic objects such as tables and shelves, women are probably referred to here. "Our kind" may be women.
"Inherit the earth" is a New Testament allusion, of course, referring to the meek that will inherit the earth, according to Jesus's Sermon on the Mount. Again, this most likely connects mushrooms/women to the meek that will inherit the earth.