Nature prefers to grow plants together intensively.
Nature likes life everywhere.
Thus when we have an open area without plants in it, weeds and other plants magically appear. This is the way trees, grains, herbs, flowers and vegetables grow when left to themselves. It is part of the biological life process. The Chinese observed this over 4,000 years ago, and imitated this living balanced complex diversity in their farming. That was one of the reasons that Asian agriculture remained sustainable for at least 4,000 years .