Horseweed, Conyza canadensis (L.) Cronq., native
common name: marestail
- a dicot in the Asteraceae family -

Horseweed grows quickly when the weather turns hot in late June and July. It can grow to over 6 feet tall. Horseweed prefers dry sunny locations and can be found growing near annual sunflowers on many roadsides in the Central Valley.
 
 

horseweed is easy to spot in the fall and winter landscape
 
 
 
 
 
 
 

Horseweed is easy to identify in the winter landscape
 
 











Horseweed stems are tall and erect, blooming only at the top. Seeds are small and fluffy

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