Italian Arum
Arum italicum
Washington State Classification
Class C — Widespread, County-Selected Control
Italian arum is a nonnative perennial that was originally introduced as an ornamental plant.
Quick Reference
Identification
Growth Habit
Italian arum is a perennial, herbaceous plant that grows from tubers. Numerous tubers are produced during the growing season.
Leaves
Leaves emerge in the fall to late winter and die back in the summer. Leaf blades are arrowhead-shaped, green and may have cream, silver-gray or other colored veins and markings. Leaves on young plants may be more oval in shape.
Flowers
Flowers are made up of a spathe and spadix. They emerge and bloom in late April to June and give off a displeasing odor.
Fruit & Seeds
Fruit is a orange-red berry. Berries are in tight, oblong clusters.
Impact
Italian arum is a nonnative perennial that was originally introduced as an ornamental plant. It has now naturalized in a number of counties in Western Washington and appears to be spreading more rapidly as additional infestations are being discovered. Due to it establishing in riparian areas and other habitats, its toxicity, and being very difficult to control once established, it is a Class C noxious weed to raise awareness and promote its control.
Ecology & Spread
Habitat
Please click here for a county level distribution map for Italian arum in Washington.
Spread Mechanisms
Reproduction
Italian arum reproduces by seeds and vegetatively by tubers.
"