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Ki Shoubu or Yellow Flag Iris: Another Beautiful Invasive

The landscape of Tokyo is laced with waterways large and small. Built to bring water to the city for drinking, irrigation, and sewage purposes many of them still exist as green ways of one sort or another. They also serve as precious wildlife havens where the city's wildlife - civets, snakes large and small, salamanders, ducks, herons, fish, along with an assortment of smaller birds - can move about, feed, nest, and generally enjoy life. (People enjoy them, too, as bike or walking paths.)*

One such small canal near the university where I teach is in magnificent bloom at the moment. I snapped these photos of Ki Shoubu (Yellow Flag Iris) on the way to class as their show of color is nothing short of brilliant. Like fleabane daisy, this iris is technically an invasive here. There are native varieties of iris about as well, but the yellow flag seems to be dominating the scene at the moment with their three elongated petal heads. Again according to Kevin Short's Nature in Tokyo, the yellow flag's favorite place is along the shores of ponds or waterways, and they can grow to be a meter tall. These fit the bill perfectly, nearly filling the channel in their enthusiasm.

*Thanks to Tokyo Architours for opening up a whole new world of waterways! We hope to see you here again someday.

What's your favorite invasive in bloom at the moment?


Anjuli said…
I love this picture!
Many thanks, Anjuli! The flowers are just stupendous this year. I'm shocked to find myself in love with all these darn invasives. We always love the bad ones, don't we? :)
Rhizowen said…
Is that Iris pseudacorus, what we in the Uk know as "yellow flag"?
Rhiz, According to Kevin Short's book it is exactly that variety. Is it also considered an invasive in England?

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