I am not in Poland, but Wojtek took these photos of the Tiny Meadow on May 21. The sticks were knocked down, but something is growing there.
However, at this point, we are not entirely sure just what that growth is. The feathery one below could be Chamomile (Rumien Polny) or Mayweed (Maruna Bezwonna).
The seedlings below are abundant. Not sure what they are yet. Not Chamomile, not Mayweed. The broad leaves indicate Chrysanthemum or Poppy. All the other flowers in this mix have narrower leaves (Vetch, Cornflowers, Corncockles), and since there were not very many Poppy seeds in the mix, my guess is Chrysanthemum.