It is kinda hard to tell, you said you bought it from a supplier, then idk why it wouldn't be, now is it canary reed grass or reed canary grass, idk if those are to diff species.
I guess you could wait till it flowers will be a little easier identifying.
Description
The stems can reach 2.5 m in height. The leaf blades are blue-green when fresh and straw-colored when dry. The flowers are borne on the stem high above the leaves and are pinkish at full bloom.
"You are an explorer, and you represent our species, and the greatest good you can do is to bring back a new idea, because our world is endangered by the absence of good ideas. Our world is in crisis because of the absence of consciousness."
— Terence McKenna
"They Say It helps when you close yours eyes cowboy"