The Birch is not the first trees in the season which flowers, but it has highly allergenic pollen. Although there is a flowering-calendar which indicates the usual period of flowering, you can see in the graph this can vary a lot. In 2017 there was a birchpollen peak (in the Netherlands) at the end of […]

Grasspollen concentration by day

There are several types of grass which release allergenic pollen, like rye, timothy, orchard and bermuda, but also corn pollen can cause problems. You can see in the graph below that the flowering period (in the Netherlands) starts early may and lasts until the end of july. About Grasses Poaceae or Gramineae is a large […]