De or het mosterdplant?

The correct Dutch article is:

de mosterdplant

How to use mosterdplant

the mosterdplantde mosterdplant
this mosterdplantdeze mosterdplant
that mosterdplantdie mosterdplant
our mosterdplantonze mosterdplant
your mosterdplantjouw mosterdplant
every mosterdplantelke mosterdplant
which mosterdplant?welke mosterdplant?
a big mosterdplant / the big mosterdplanteen grote mosterdplant, de grote mosterdplant