Japan Visitor: What's happening in Tokyo, Nagoya, Kyoto, Osaka, Shimane Japan

Home    Japan Travel Guide     Tokyo Guide     Contact     Auction Service     Japan Shop

Saturday, October 30, 2010

Butakusa Ragweed

The tall yellow weed seen at this time of year along river banks and on waste ground is ragweed (Ambrosia artemisiifolia, known in Japanese as ブタクサ (豚草) lit. "pig grass."

Butakusa Ragweed


This invasive plant is also a major source of allergy from the pollen on its yellow seeds and affects people who also suffer from allergies to the pollen from Japanese cypress (hinoki) and cryptomeria (sugi) trees.

© JapanVisitor.com

Yahoo Japan Auction Proxy Service
Japanese Dating
Tokyo Rental Apartments
Jobs in Japan
Rough Guide To Japan
Keywords
Japan Trees
pollen
ragweed
hay fever
Japanese plants

1 comment:

Marchije said...

Hi there.

I noted that the picture you have provided is not ambrosia artemisiifolia (i.e. ragweed) and looks closer to the plant known as goldenrod. According to Wikipedia, a variant of goldenrod native to North America known as solidago canadensis has reportedly become an invasive species of plant in China and perhaps it has in parts of Japan as well, although I think your picture actually looks closer to the variant of goldenrod known as solidago altissima which is also native to North America. It is not uncommon for people to mistake goldenrod for ragweed because goldenrod happens to thrive in many of the same areas as ragweed and both plants happen to flower at around the same time. Given those who react to ragweed will more often notice goldenrod’s bright yellow flowers in areas where they are the most prone to their allergy symptoms, they will sometimes conclude that it is goldenrod who is the culprit.

Some helpful links on this subject with images of both plants:

http://en.wikipedia.org/wiki/Ambrosia_artemisiifolia

http://en.wikipedia.org/wiki/Solidago_canadensis

http://en.wikipedia.org/wiki/Solidago_altissima

http://ontariowildflowers.com/mondaygarden/article.php?id=129

http://www.newton.dep.anl.gov/askasci/bot00/bot00072.htm

http://www.youtube.com/watch?v=cg4eeQHqt7I

Cheers!