Pollen corona / walnut (Juglans)

Season for walnut-tree pollen:
Mid of April to Mid of June
Sketch of a walnut pollen corona around the moon, artificially caused by shaking some branches.
Richard Löwenherz, Klettwitz, 09.05.98, in the evening


Walnut pollen coronae could, up to now, only be generated by shaking the branches of a walnut tree. The reason is the scarcity of walnut trees. In southern countries, this type of coronae should probably be more frequent and easier to observe.