Iris laevigata 'Mottled Beauty' is a form of the Japanese water iris, with smooth, sword-shaped leaves in an upright clump. In May and June it carries flowers mottled in blue and white.

'Mottled Beauty' at a glance

Botanical name Iris laevigata 'Mottled Beauty'
Common name Japanese water iris, smooth iris
Plant type Clump-forming iris; dies back in winter
Height and spread About 70–80 cm tall
Flowers Mottled blue and white (descriptions vary), May and June
Position Full sun (tolerates part shade)
Soil Moist to wet, humus-rich, acid to neutral soil, or shallow water
Pond depth 0–15 cm of water over the crown
Hardiness RHS H6 – hardy in a very cold winter (-20 to -15°C) (species rating)
Native to Garden form of an East Asian iris (not UK native)

Can it grow in water?

Yes. Unlike Iris ensata, Iris laevigata is a true marginal that tolerates standing water all year, with up to 15 cm over the crown, or permanently moist soil.

Where to plant it

  • A sunny pond shelf, 0–15 cm deep
  • The wet margins of ponds and streams
  • Bog gardens with acid to neutral soil

How to plant and care for it

Plant in spring or summer. Watch for slugs, snails and iris sawfly.

Is it poisonous?

Yes. Irises are harmful if eaten by people or pets, so wear gloves when handling it.

Which size should I buy?

Bare-root plants (7 cm, 9 cm, 1 litre and 3 litre) arrive without a pot or compost and are the most economical way to plant a group. Potted plants (9 cm, 1 litre and 3 litre) arrive growing in our peat-free compost and give a faster display. Packs of 3 come in 7 cm, 9 cm, 1 litre and 3 litre bare-root sizes and cost less per plant. The 2x Pot & Compost option is two plants supplied with pots and compost.

Pond depth: 0 - 15cm

Light: Full sun

Hardiness: Hardy

Height and spread: 40 - 80cm tall, 50 - 100cm wide

Planting and flowering months are shown in the calendar under the photos.

Bare root (7 cm, 9 cm, 1 litre, 3 litre): plants sent without a pot or compost, ready to plant straight away. The most economical way to plant a group.

Potted (9 cm, 1 litre, 3 litre): plants growing in our recycled, peat-free compost made in Lincolnshire. Larger sizes give a faster display.

Pack of 3 (7 cm bare-root, 9 cm bare-root, 1 litre bare-root, 3 litre bare-root): three plants of the chosen size at a lower price per plant.

2x Pot & Compost: two plants supplied with pots and compost.

Sizes shown with a line through them are currently unavailable.

At Lincs Plants, we strive to provide fast and reliable shipping to ensure your plants arrive in perfect condition. We offer 1-3 day shipping through a variety of dispatch methods to suit your needs.

Processing Time:
Orders are processed within 1 - 3 business day after payment confirmation. Orders placed on weekends or public holidays will be processed the next business day.

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Should you have any questions or concerns about your shipment, feel free to contact us.