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
A rhizome of
^ Western Farm Press. Johnsongrass resistance to glyphosate confirmed in Argentina[permanent dead link], Aug 28, 2006. (accessed 2010.01.06) ^ Monsanto. Glyphosate-resistant Johnsongrass Confirmed in Two Locations Archived 2011-07-14 at the Wayback Machine., March 12, 2008. (accessed 2010.01.06) ^ Delta Farm Press. Glyphosate-resistant Johnsongrass in Mid-South Archived 2008-05-11 at the Wayback Machine., March 19, 2008 (accessed 2010.01.06) ^ BugwoodWiki  Holm, L. G., P. Donald, J. V. Pancho, and J. P. Herberger. 1977. The World's Worst Weeds: Distribution and Biology. The University Press of Hawaii, Honolulu, Hawaii. 609 pp. ^ Dept of Soil and Crop Science, Texas A & M University ^ Ohio State Uni. Agricultural Research and Development Center ^ J. H. Maiden (1889). The useful native plants of Australia : Including Tasmania. Turner and Henderson, Sydney.
Johnsongrass - US Department of Agriculture
Kansas Wildflowers and Grasses - JOHNSON GRASS page. Includes photos.
Species Profile- Johnsongrass (