De or het prairiegras?

The correct Dutch article is:

het prairiegras

How to use prairiegras

the prairiegrashet prairiegras
this prairiegrasdit prairiegras
that prairiegrasdat prairiegras
our prairiegrasons prairiegras
your prairiegrasjouw prairiegras
every prairiegraselk prairiegras
which prairiegras?welk prairiegras?
a big prairiegras / the big prairiegraseen groot prairiegras, het grote prairiegras