Before revision: White clover is included in some grass seed mixes, because it is a legume that fertilizes the soil A beneficial weed is an invasive plant that has some companion plant effect, is edible, contributes to soil health, adds ornamental value, or is otherwise beneficial.
After revision: White clover is included in some grass seed mixes, because it is a legume that fixes soil nitrogen with help of mycorrhiza A beneficial weed is an invasive plant that has some companion plant effect, is edible, contributes to soil health, adds ornamental value, or is otherwise beneficial.