Itchgrass

Nature 
Itchgrass [Rottboellia exaltata] is a rank, aggressive, annual grass creating problems in many regions of the world, and may be considered among the world's worst weeds. It has the ability to grow taller than most crops, can grow at any time during the crop season (in both sun and shade), and produces stiff, barb-like hairs that are extremely irritating to human skin.
Broader 
Aggravates 
Type 
(E) Emanations of other problems