Being made up of many different plants, these populations evolve (hence their name), that is, they change from one season to the next because every year natural selection favors the plants most suitable for that soil, that climate, that type of organic agriculture and after a few years they will be perfectly adapted to the place where they are cultivated.
This implies that the organic farmer is able to produce his own seed every year.
When they move to a new location, they change to adapt to those new conditions.
In addition, the extraordinary diversity they contain protects them from diseases, insects and, in the case of cereals, from weeds - this has been demonstrated by scientific research - eliminating the use of chemistry (even that allowed in organic farming), thus making the farmer's task easier and reducing expenses.