Hedges Direct 
Iris Pseudacorus (Yellow Flag) - 2L Pot Iris pseudacorus
Out of stock
Key Features
NATIVE
AVERAGE GROWING
HAS FLOWERS (Yellow)
Seasonal Availablity
- JAN
- FEB
- MAR
- APR
- MAY
- JUN
- JUL
- AUG
- SEP
- OCT
- NOV
- DEC
Description
Iris pseudacorus, commonly known as Yellow Flag, is a vigorous native marginal perennial that brings bold colour and strong vertical structure to pondsides, bog gardens, and damp borders. This striking British native forms tall clumps of upright, sword-shaped green leaves, creating an architectural presence that looks superb in naturalistic and wildlife-friendly planting schemes.
From late spring into early to midsummer, Iris pseudacorus produces rich yellow flowers, sometimes marked with subtle brown veining, held above the foliage on sturdy stems. The cheerful blooms are highly attractive to pollinating insects and make this species a valuable addition to gardens designed to support wildlife.
Ideal for planting at the margins of ponds, lakes, and streams, Yellow Flag also thrives in deep, reliably moist soil away from open water. Its robust, clump-forming habit makes it especially useful for larger damp planting areas, where it can create a naturalistic effect and provide strong seasonal impact.
Hardy and easy to grow, Iris pseudacorus performs best in full sun or light shade with consistently moist to wet soil. Supplied in a 2L pot, this established plant is ready to add height, colour, and wildlife value to your garden.
Native Yellow Flag iris
Bright yellow flowers
Flowers from late spring to midsummer
Upright sword-like green foliage
Vigorous clump-forming habit
Ideal for pond margins and bog gardens
Great for wildlife-friendly planting
Hardy and easy to grow
Supplied in a 2L pot
Position:
Plant in full sun or light partial shade. It is especially well suited to open pond margins and damp, sunny sites.
Planting:
Grow in shallow water at the pond edge or in deep, moisture-retentive soil. It is ideal for bog gardens, wetland-style planting, and other reliably damp areas.
Watering & Feeding:
Keep the soil consistently moist or wet, especially during establishment. In ordinary borders, it performs best where the soil does not dry out. This moisture guidance is supported by RHS and pond plant sellers describing it as a bog and marginal aquatic plant.
Pruning:
Remove faded flower stems after blooming and cut back old foliage as needed to keep the plant tidy. Divide established clumps every few years if they become too large. Gardeners’ World specifically recommends dividing rhizomes every three to five years to keep it under control.
Winter Care:
Very hardy in UK gardens. Leave plants in place over winter, but avoid letting container-grown specimens dry out completely.
Q: Is Iris pseudacorus suitable for pond margins?
Yes, it is one of the classic marginal pond plants and thrives in shallow water or very damp soil.
Q: What colour are the flowers?
The flowers are bright yellow, sometimes with brown markings.
Q: Is Yellow Flag a native UK plant?
Yes, it is a British native species widely associated with riversides, ponds, and wetland areas.
Q: Can it grow away from water?
Yes, provided the soil remains reliably moist. It is also suitable for bog gardens and damp borders.
Q: Is it easy to maintain?
Yes, it is a hardy and dependable perennial, though vigorous clumps may need dividing over time.
Vital Plant Information
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Step 1
Root Grow & Fertiliser
Ensure you buy root grow and fertiliser with your plants at the time of purchase
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Step 2
Prepare Your Planting Area
Make sure your planting area is in good condition and suitable for planting
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Step 3
Plant & Feed
Plant with root grow & the second feed. Support plants if necessary. Water regularly