I have some Phalaris A. seeds. You can find them online at a lot of entheobotanical shops.
you may want to look into Phragmites anstralis.
I think the dmt percent is higher and I think it grows all over the place on roadsides. It is a very tall grass with puffy tops. The dmt is in the rhizomes and I read that around 45g is enough for an ahyuasca session.