Yellow flag

Iris pseudacorus and cvs.

Photo/Illustration: 
Courtesy of White Flower Farm
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Yellow flag (Iris pseudacorus and cvs.)
EYE-riss soo-DAY-kor-us
Genus:  Iris
Yellow flag is a vigorous Laevigata iris with ribbed, sword-shaped gray-green leaves. It grows to 3 to 4 feet high. Over 60 cultivars exist, including ‘Beuron’, with evenly yellow flowers; ‘Ecru’, with its off-white blooms; ‘Fresh Cream’, with lovely, pale-yellow flowers marked with red-violet signals; a variegated type, ‘Variegata’; ‘Donau’, a bright-yellow flower adorned with a brown signal that looks like stitchery; and nearly sterile ‘Holden Clough’, with deep-yellow blooms and reddish purple veining.
Noteworthy Characteristics:  Extremely adaptable. Self-seeds freely along streambanks and edges of ponds. Flourishes in both shallow and deeper waters.
Care:  Grow in full sun to part shade and most any moist soil. Cut flower spikes at the end of the growing season to prevent excessive self-seeding. Sterile cultivars exist.
Propagation:  Lift and divide clumps, or separate bulb offsets, and plant immediately, in early autumn.
Problems:  Iris borer, verbena bud moth, whiteflies, iris weevil, thrips, slugs and snails, aphids, and nematodes.

Overview

Height
3 ft. to 6 ft.
Growth Pace
Fast Grower,
Invasive/Aggressive Grower
Light
Full Sun to Part Shade
Moisture
Adaptable
Maintenance
Moderate
Characteristics
Self Seeds,
Showy Flowers
Bloom Time
Summer
Flower Color
Primrose Yellow
Uses
Beds and Borders,
Cut Flower,
Waterside
Style
Water Garden
Seasonal Interest
Summer Interest
Type
Perennials

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