I. pseudacorus is one of two
Iris species native
to Great Britain, the other being the Stinking Iris (Iris foetidissima).
It is an extremely vigorous, hardy plant and
has become an invasive plant in some areas.
These plants grow best along or in ponds or
streams.
Yellow Flag
Iris have yellow flowers (of course) with
brown colored veins. The blooms are 1˝-2
inches wide and open in early to mid-summer.