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Making headway at Yellow Flag Iris sites

Making headway at Yellow Flag Iris sites
Kiran Pal-Pross - Sat Sep 27, 2014 @ 10:49PM
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In 2012 and 2013, our field crew treated the Yellow flag iris infestation at Finch Street, Squamish by pulling and cutting the vegetation (primarily seed heads). Cutting the vegetation prevents the spread of seeds and should eventually deplete the energy reserves in the root mass, but the process takes around five to six years of continued cutting.

This year, the crew dug out the entire root mat, and removed the material from the site. Yellow flag iris spreads by seed as well as by rhizome so we will need to monitor this site over the next few years for regrowth, but it is hoped that the root mat removal will reduce the amount of regrowth next spring, and help us move towards eradication at this site.

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