Irises are perennial plants that grow from bulbs in dry climates.

The three sepals which usually spread or bend downwards are called the 'falls'.

The three, sometimes reduced, petals stand partially upright behind the sepal base. They are called 'standards'.

Nearly all species are found in temperate Northern Hemisphere regions from Europe to Asia and throughout North America.

Despite the diversity in ecology, Iris is primarily found in dry, semi-desert or cold rocky mountain areas.

Irises are widely grown as ornamental plants in home and botanical gardens.

In the United Kingdom the iris is promoted by the British Iris Society.

The national collection of Arthur Bliss irises is housed in Gloucestershire.

In water purification, yellow iris is often used.

It has been banned in some states in the US where it is found blocking natural waterways.