De or het interieurbeplanting?

The correct Dutch article is:

de interieurbeplanting

Rule Words ending in -ing: almost always de. See the rule

How to use interieurbeplanting

the interieurbeplantingde interieurbeplanting
this interieurbeplantingdeze interieurbeplanting
that interieurbeplantingdie interieurbeplanting
our interieurbeplantingonze interieurbeplanting
your interieurbeplantingjouw interieurbeplanting
every interieurbeplantingelke interieurbeplanting
which interieurbeplanting?welke interieurbeplanting?
a big interieurbeplanting / the big interieurbeplantingeen grote interieurbeplanting, de grote interieurbeplanting