Thanks everyone.
Hi Savannah! There are a lot of different types of Phormium. P. cookianum is called Mountain Flax.
There are quite a few dwarf types because not everyone has the room to grow out the P. tenax variety.
P. tenax can get 6 x 6' in 3 years or so. Fair warning to anyone buying those little pots of it.
They are in the lily family, not a grass.
I think mine is actually P. cookianum 'Rainbow Surprise'.
There are actually 2 different types of Phormium in that pot bought at 2 different garden centers, 2 different names but they look a LOT alike.
In NC mine came back every spring, but one particularly cold winter 'almost' did it in.
It did frost burn all the way to the ground but came back from the roots.
Phormium 'Jester' is a nice dwarf variety with variegated coral, white and green leaves.