JOHNSON GRASS or JOHNSONGRASS,
* Foliage that becomes wilted from frost or hot, dry weather can contain sufficient amounts of hydrogen cyanide to kill cattle and horses if it is eaten in quantity. * The foliage can cause 'bloat' in such herbivores from the accumulation of excessive nitrates ; otherwise, it is edible. * It grows and spreads so quickly, it can 'choke out' other cash crops planted by farmers.
This species occurs in crop fields, pastures, abandoned fields,
rights-of-way, forest edges, and along streambanks. It thrives in
open, disturbed, rich, bottom ground, particularly in cultivated
It is named after an Alabama plantation owner, Colonel William Johnson, who sowed its seeds on river-bottom farm land circa 1840. The plant was already established in several US states a decade earlier, having been introduced as a prospective forage or accidentally as a seedlot contaminant.
* ^ Western Farm Press. Johnsongrass resistance to glyphosate
confirmed in Argentina, Aug 28, 2006. (accessed 2010.01.06)
* ^ Monsanto. Glyphosate-resistant Johnsongrass Confirmed in Two
Locations Archived 2011-07-14 at the