Melilotus officinalis and M. alba can be found in disturbed areas, commonly along roadsides.
 
 
 

However, it can also be found climbing up hillsides, or in meadows,
 
 

.... or in areas away from disturbed areas, such as this riparian area.
 
 
 

Yellow sweet clover have several traits that allow them to be competitive.  M. officinalis and M. alba fix nitrogen from bacteria that form nodules on their roots.
 
 

These biennial species form extensive root systems in their first year.