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Iris pseudacorus, also named the Yellow Flag and Pale
Yellow Iris, is native to Europe, North Africa and the
Mediterranean region. Iris pseudacorus is a perennial
reaching 2-3 feet tall.
The slender branching stems, as long as the leaves, bear
3-5 pale to deep yellow flowers 4 inches across. The
flowers have 3 large downward-spreading sepals and 3
smaller erect petals; on each flower sepal are patterns
of delicate light-brownish to purple veins or flecks.
Iris pseudacorus is flowering in early Spring in the
South (Florida) and in Summer in the North (Canada).
It is a tall plant with long, dark green, flattened,
sword-like leaves, arising in a fan from the soil. Its
leaves sometimes die back over Winter, but persist if
Winters are mild. Fruit a capsule, seed pod, large to 4-8
cm, glossy green. The plant spreads by means of its
modified stems, rhizomes, which are located below the
soil surface.
Hardiness zones 4-9, (-32°C/-25°F, -5°C/25°F) in
Winter. A very adaptive species, it is tolerant of dry
soils, where it will be shorter; although it is a water-loving
species that grows best in wet areas and full sun. This
Iris likes acid conditions.
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