BOTANICAL NAME: Iris pseudacorus AVERAGE MATURE HEIGHT: 120 cmAVERAGE MATURE SPREAD: 60 cmSUN EXPOSURE: Full Sun to Partial ShadeFLOWER COLOUR: FLOWERING TIME: FOLIAGE COLOUR: COLD HARDINESS: Zone 3aWATER NEEDS: OTHER FEATURES:  Ornamental Features Yellow Flag Iris has masses of beautiful yellow flag-like flowers...
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 BOTANICAL NAME: Iris pseudacorus

AVERAGE MATURE HEIGHT: 120 cm
AVERAGE MATURE SPREAD: 60 cm
SUN EXPOSURE: Full Sun to Partial Shade
FLOWER COLOUR: 
FLOWERING TIME: 
FOLIAGE COLOUR: 
COLD HARDINESS: Zone 3a
WATER NEEDS: 
OTHER FEATURES: 

Ornamental Features

Yellow Flag Iris has masses of beautiful yellow flag-like flowers with yellow falls at the ends of the stems in mid spring, which are most effective when planted in groupings. The flowers are excellent for cutting. Its sword-like leaves remain green in colour throughout the season. The fruit is not ornamentally significant.

Landscape Attributes

Yellow Flag Iris is an herbaceous perennial with tall flower stalks held atop a low mound of foliage. Its medium texture blends into the garden, but can always be balanced by a couple of finer or coarser plants for an effective composition.

This plant will require occasional maintenance and upkeep, and should be cut back in late fall in preparation for winter. Deer don't particularly care for this plant and will usually leave it alone in favor of tastier treats. Gardeners should be aware of the following characteristic(s) that may warrant special consideration;

  • Insects

Yellow Flag Iris is recommended for the following landscape applications;

  • Mass Planting
  • General Garden Use
  • Bog Gardens

Planting & Growing

Yellow Flag Iris will grow to be about 30 inches tall at maturity extending to 4 feet tall with the flowers, with a spread of 30 inches. When grown in masses or used as a bedding plant, individual plants should be spaced approximately 24 inches apart. The flower stalks can be weak and so it may require staking in exposed sites or excessively rich soils. It grows at a medium rate, and under ideal conditions can be expected to live for approximately 10 years.

This plant does best in full sun to partial shade. It is quite adaptable, prefering to grow in average to wet conditions, and will even tolerate some standing water. It is not particular as to soil type or pH. It is somewhat tolerant of urban pollution. This species is not originally from North America. It can be propagated by division.

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