re: #64 Gus

Poisonous Plants of the Southern United States

[Johnsongrass] Found throughout the south; most abundant in fields, waste places, fence rows and on ditch banks. Particularly abundant in rich delta land such as in Mississippi. Once widely cultivated as a hay and pasture crop.

TOXICITY
Under conditions of drought, trampling, frost, or second growth, the plants may contain cyanide. In addition, if heavily fertilized with nitrogen, there is a possibility of nitrate poisoning if the plants are drought stricken.