Pollen Season
Cryptomeria pollen dispersal starts when average daily temperatures reach 10 degrees Celsius, partly depending on wind and terrain. Like the cherry blossom season, the pollen season moves from south to north across Japan, and from lower to higher elevations as spring progresses. For western and eastern Japan (including Tokyo and the surrounding KantÅ region) this means the hay fever season starts between end of January and mid-February. The cryptomeria pollen season peaks in the second half of March - first half of April in these areas, then declining over the following six to eight weeks. Japanese cypress pollination lags cryptomeria by about a month. Some people are more sensitive to one of the two pollen types and therefore may experience allergic symptoms earlier or later than others.
Read more about this topic: Hay Fever In Japan
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