PARTHENIUM hysterophorus is also known by the name of carrot grass or gajar ghas as we desis call it. It is one of the most noxious weed found mostly in non farm land area of Punjab and many other north Indian states.. one can find it easily in a no man`s land or unused land. It can be identified as a tall grass, having roots deep inside the soil and plenty of branches emerge in this plant of 3 to 4 feet height at the fully flowered stage.
planting this plant may be hazardous. it is known to cause skin allergies and respiratory problems. Crop production fails gradually after land is fallen prey to this grass.
But, at the same time its use has been also found beneficial in skin inflammation, diarrhea, urinary infections, etc.
so, its health hazard itself nd yet used in some medicinal purposes.
what I understand is its combination with certain other things kills its ill effects and so it has some medicinal values. it is also known to increase production of bio gas.
Else, as a mere grass its a weed.