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Iris pseudacorus

 
Iris pseudacorus
yellow flag
Common name yellow flag
Family iridaceae
Life cycle perennial (Z4-9)
Flowers yellow (late spring)
Size 4-6'
Light sun-part shade
Cultural notes moist-wet soil

Growing in our bog filtration zone, where they compete with our other aquatic iris, blue flag, for total domination. Both are strong-growing, increasing their clump year after year – which makes them perfect for the biological filter, where they take up nutrients and help clear the water in the big pond. Their aggressive habits can be problematic in the wild, where they can crowd out other plants - but in the confinement of our bog filter, I think I'll manage to keep them under control.

We left this plant behind in our Pennsylvania garden (and wish it well); we don't grow it in Houston.

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Last modified: May 24, 2015
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