Iris pseudacorus P9

Iris pseudacorus, commonly known as yellow flag iris, is a robust and striking aquatic perennial native to wetlands and riverbanks. It produces tall, sword-like green foliage and vibrant yellow flowers from late spring to early summer. This iris is particularly well-suited to planting around ponds, streams, and bog gardens, where it provides vertical interest and naturalises easily. Known for its tolerance of very wet conditions, it is also beneficial for wildlife, offering habitat and food for pollinators and aquatic species.

Why We Like It

• Bright yellow blooms brighten up water garden margins

• Thrives in wet and boggy areas

• Attracts pollinators and supports biodiversity

What to Know

• Prefers full sun to partial shade

• Needs moist to wet soil—ideal for pond edges

• Can spread vigorously; manage to prevent invasiveness

• Deadhead to reduce self-seeding

• Cut back in autumn to maintain tidy growth

Flower Colour
Yellow

Flowering Months
May, June

Height and Spread
Height: 90–120 cm
Spread: 60–90 cm