Weeds

Fine -> clondy

In these days, I have read a book named "Weeds: Guardians of the soil" which I borrowed from master.
It says it is necessary for plants to grow up with weeds for becoming the good quality. Roots of weeds cultivate the soil deeply then make water and air go through easier, and pull back sunk nourishment up to the surface of planting, not only to keep these nourishment into its own body but also nourishment comes up along the surface of the roots of weeds, etc, it says about the good functions of weeds with various examples.

I have read the other function of weeds, then I guess...
Weeds can be a companion plant.
Weeds can be the large part of balanced great variety of plants which nature makes.
It means weeds can protect the object plants from insects and disease if we control them.