Weeds are weeds only from our human egotistical point of view, because they grow where we do not want them. In Nature, however, they play an important and interesting role. They resist conditions which cultivated plants cannot resist, such as drought, acidity of soil, lack of humus, mineral deficiencies, as well as a one-sidedness of minerals, etc. They are witness of man’s failure to master the soil, and they grow abundantly wherever man has ‘missed the train’ - they only indicate our errors and Nature’s corrections. Weeds want to tell a story - they are nature’s means of teaching man, and their story is interesting. If we would only listen to it we could apprehend a great deal of the finer forces through which Nature helps and heals and balances, and sometimes, also has fun with us.
— Weeds And What They Tell, by E. Pfeiffer