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Weed Calendar
Onionweed
Asphodelus fistulosus
Winter/Spring
An attractive flowering plant that can take over rangeland and grasslands. Both a state of Arizona class B noxious weed and a federally listed noxious weed. Photo: John Ruter, University of Georgia, Bugwood.org
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Ripgut brome
Bromus diandrus
Winter/Spring
A winter annual grass that favors riparian areas and produces seed heads that can harm livestock and pets. A state of Arizona class B noxious weed. Photo: Joseph M. DiTomaso, University of California - Davis, Bugwood.org
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Stinknet
Oncosiphon pilulifer
Winter/Spring
A winter annual with distinctive yellow flowers that is spreading at an unprecedented speed. A state of Arizona class B noxious weed. Photo: Sue Carnahan
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African sumac
Searsia Lancia
All Year
An evergreen tree introduced for landscaping that has escaped into the wild. A state of Arizona class B noxious weed. Photo: Dan Beckman
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Giant reed
Arundo donax
All Year
A perennial giant grass that clogs up waterways and guzzles water. A state of Arizona class B noxious weed. Photo: Karan A. Rawlins, University of Georgia, Bugwood.org
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Spotted knapweed
Centaurea stoebe
All Year
A biennial or perennial flowering plant that grows in higher elevations in our area . A state of Arizona class A noxious weed. Photo: Rob Routledge, Sault College, Bugwood.org
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Yellow bluestem
Bothriochloa ischaemum
Fall
A fast-spreading perennial grass that is very hard to eradicate once established. A state of Arizona class B noxious weed. Photo: Michelle Villafranca, Fort Worth Nature Center & Refuge, Bugwood.org
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