The Bielowieza forest is surrounded on the Polish side by farmland, much of which is hayed for dairy cattle. Polish farmers seem to prefer haying their meadows of grasses and forbs, rather than planting monocultures of alfalfa. As a result, forest visitors (the human variety) are treated to a colorful scene of perennial blooms, very similar to that we see in Minnesota prairies, only with a lot more color.
We were amazed to find a number of the same species present in Polish prairies as we might find along roadsides in the U.S. Of course we call these weeds, and perhaps they are in Poland, too. Or perhaps they really are part of the natural prairie mixture.