De or het laanbeplanting?

The correct Dutch article is:

de laanbeplanting

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

How to use laanbeplanting

the laanbeplantingde laanbeplanting
this laanbeplantingdeze laanbeplanting
that laanbeplantingdie laanbeplanting
our laanbeplantingonze laanbeplanting
your laanbeplantingjouw laanbeplanting
every laanbeplantingelke laanbeplanting
which laanbeplanting?welke laanbeplanting?
a big laanbeplanting / the big laanbeplantingeen grote laanbeplanting, de grote laanbeplanting