Description of Iris ensata (Japenses Water Iris)

Q: Is Iris kaempferi the same as Japanese iris?

Yes. Iris kaempferi is an older name used for Iris ensata.

Iris ensata is Japanese iris, also commonly sold as Iris kaempferi. It is one of the best irises for bog gardens because it loves rich wet soil and produces big ruffled flowers in early summer.

Appearance

It forms tall fans of narrow leaves, then sends up flower stems around 70 to 120cm depending on the cultivar and conditions. Flowers are large, flat to ruffled, and often have bold markings. Flowering is usually June into July in the UK.

Care Guide

The key is moisture at the right time. Keep it wet in spring and early summer while buds form.

Sun: Full sun gives the best blooms. Part shade is fine in wet soil.
Soil: Humus-rich, moisture-holding soil. Neutral to slightly acid suits it well.
Water: Keep constantly moist through spring and early summer. Avoid drying out.
Feeding: A spring feed supports bud formation, especially in baskets.
Division: Divide in spring every few years to keep clumps vigorous.

In liner bogs, plant it in a deeper pocket so the surface stays wet during hot spells.

Suitability for Bog Garden

Iris ensata is ideal for bog gardens and pond edges. It is best as a feature plant in the middle or back of the bed, with lower plants in front to cover the base of stems.

Plant in groups for a fuller display. One clump can look lost once flowering finishes.

FAQ

When does Iris ensata flower?
Usually early to mid summer, often June and July.

Does it need to sit in water?
It prefers wet soil. Very shallow water can work, but it is best as a bog-margin plant.

Is Iris kaempferi the same as Japanese iris?
Yes. Iris kaempferi is an older name used for Iris ensata.

How do I get more flowers?
Keep it wet in spring and early summer, feed in spring, and grow it in good light.