How to Manage Pests

Pests in Gardens and Landscapes

Iris, Dutch iris, Bulbous and Rhizomatous iris—Iris spp.
Family Iridaceae* (Iris family)

Plant Identification

Irises are perennial plants that grow from bulbs and rhizomes.  There are more than 200 species of irises.  Leaves are tall and grasslike.  Flowers consist of 3 inner petals and 3 outer petals and vary in color including white, purple, pink, blue, orange, and yellow.  Plants bloom primarily in spring or early summer.

*Some species are invasive weeds. Other species may be better choices when planting.

Optimum conditions for growth

Irises survive under a wide variety of conditions according to species.  They may do well in full sun or full or partial shade.  Most species require regular water during the growth and bloom period.  Plant in well-drained soil.  Divide in late summer when crowded.

White iris blossoms
White iris blossoms

Pests and disorders of Iris spp.



Environmental disorders



Statewide IPM Program, Agriculture and Natural Resources, University of California
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