This species of Phalaris was found to have the richest overall alkaloid content in the investigation of Phalaris species conducted by Festi and Samorini. It has also been reported (not by Festi and Samorini) to contain a very potent and clean alkaloid profile, consisting mostly, if not exclusively, of N,N-dimethyltryptamine.

Originally from Portugal, this annual plant's growth habits and cultural requirements are similar to Phalaris aquatica. It grows most actively during the spring and fall, while resting during the heat of midsummer and the short cool days of winter. It also must be protected from heavy freezes.
Livestock should not feed on this grass due to the extremely high alkaloidal content of 3%. This is now known to be the ideal species for those interested in the grasses of the genus Phalaris. The grass can grow to 1-2' in height. Those growing this grass find that if allowed to go to seed it will reseed itself and come back each year. Studies of the species in Spain as an undesired weed occurring among wheat crop show that it has the ability to aggressively increase its own populations.