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PlantSnap
Plant Care
Yellow flag
(Iris pseudacorus)
Also Known As
Yellow flag, Yellow flag iris, Water flag, Yellow iris, Iris des marais
About This Plant
Iris pseudacorus is a species of flowering plant in the family Iridaceae, native to Europe, western Asia and northwest Africa. It is an herbaceous perennial that grows up to 1.5 m (4.9 ft) tall. The plant produces bright yellow flowers with three large sepals and three smaller petals, and sword-like leaves that can reach up to 1 m (3.3 ft) in length.
Plant Care Instructions
Outdoor Size Range
Height: 3-4 feet (90-120 cm), Spread: 2-3 feet (60-90 cm)
Light Requirements
Yellow flag iris prefers full sun to partial shade. It can tolerate some shade, but too much shade will result in fewer flowers.
Humidity Needs
Yellow flag iris can tolerate a wide range of humidity levels.
Fertilizing Schedule
Yellow flag iris does not require regular fertilization, but you can apply a balanced fertilizer in early spring to encourage healthy growth.
Pruning Guidelines
Remove spent flowers and yellowing leaves regularly to maintain the plant's appearance. Cut back the foliage to the ground in late fall or early spring.
Common Pests and Diseases
Yellow flag iris is generally pest and disease-resistant, but it can be susceptible to iris borer and iris rust.
Indoor Size Range
Not suitable for indoor growth
Watering Schedule
Yellow flag iris prefers consistently moist soil, but it can tolerate short periods of drought. Water the plant deeply once a week during dry periods.
Temperature Range
Yellow flag iris is hardy in USDA zones 4-9 and can tolerate a wide range of temperatures.
Growing Season
Yellow flag iris blooms in late spring to early summer.
Growing Difficulty Level
Yellow flag iris is relatively easy to grow and requires minimal maintenance.
USDA Hardiness Zones
4-9
Did You Know?
Yellow flag iris is sometimes called 'water flag' because it is often found growing in wetlands and along the edges of ponds and streams.
