Limited distribution in Utah. High priority to eradicate all known populations and prevent new ones.
Quick Facts
Report your sighting through EDDMapS to help us track and respond to new infestations.
Report on EDDMapSGiant Reed
Arundo donax
Overview
Giant reed is one of the world's most invasive plants. It forms massive, impenetrable stands along waterways, displacing native riparian vegetation and wildlife habitat. It consumes enormous amounts of water and increases fire risk. Stems can grow up to 30 feet tall.
How to Identify
Bamboo-like grass with hollow stems up to 30 feet tall. Large, broad leaves 2-3 inches wide. Feathery plume-like seed heads in late summer. Spreads by rhizomes and stem fragments.
Control Methods
Cutting alone is not effective - plants resprout vigorously. Herbicide treatment combined with cutting is most effective. Biological control agents are available.
Herbicide Recommendations
Imazapyr or glyphosate applied to cut stems or foliage. Multiple treatments over several years required. Requires permits near water.
⚠️ Always read and follow pesticide label directions. Contact your county weed superintendent for site-specific recommendations. Permits may be required near water.
Need help managing this weed?
Skyline CWMA can connect you with technical assistance, cost-share programs, and licensed contractors for treatment on your property.
