Iris (beardless laevigata) bog iris

Height 45-120cm (1-½-4ft)

Planting distance 23-90cm (9-36in)

Flowers late spring and summer

Humus-rich soil at water margins

Full sun

Rhizomes available in autumn

These are the irises seen growing around the edge of pools and in ornamental bog gardens. They form another section in the group of beardless rhizomatous irises. All are hardy and prefer moist growing conditions and should be planted in full sun.

Popular species Iris kaempferi, often called the bog iris, has white, blue or purple flowers with yellow streaks on the falls. The flowers appear in early and mid summer, three to four, single or double, flat or peony-shaped blooms on each stem. They stand 60-90cm (2-3ft) high; the rhizomes should be planted 30-45cm (12-18in) apart in moist soil. This species and its varieties will not tolerate lime. Iris laevigata has three blooms per stem – deep royal blue flowers with white streaks on the falls. The deciduous leaves are pale green. It flowers in early summer and is a true water and waterside plant, growing best in a water depth of up to 15cm (6in). Each plant reaches 45-60cm (18-24in) high, and should be set 23-45cm (9-18in) apart.

Iris pseudacorus, also known as yellow flag or flag iris, has five or more yellow flowers – sometimes pale orange with brown veins -and attractive yellow and green leaves. The flowers appear in late spring and early summer. This is another true water iris that will grow at the water edge and thrives in a water depth of 45cm (18in) -here the plants can reach 90-150cm (3-5ft) high.


Plant the rhizomes from mid summer to early autumn, in full sun, beside streams and in pools.


Divide the rhizomes after flowering every three years and replant at once.

22. February 2012 by Dave Pinkney
Categories: Annuals, Biennials, Bulbous Plants, Featured Articles | Tags: , , , | Comments Off on Iris (beardless laevigata) bog iris


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