FOUND: Prehysteria! 2.
On a side note, you guys are incredibly good and fast, thanks all!
I think this movie was about miniature dinosaurs, but that may be a different one. Anywho, the scene i recall is there is a gardener that these kids have to sneak past, he may or may not be drunk. They decide to go about this by hiding a walkie talkie (I think) by the base of a tree and convincing the gardener that the tree is talking and it needs him to prune it? He goes on about how the tree is too small, but they manage to convince him (why I think he might have been drunk) by groaning they need pruned, and then they get past him.