Geese eating roses and other plants

[Webmaster]

We have 18 geese running loose on our little farm.  It is nice that they
keep the grass short, but they also like to eat the new banana plants,
roses, etc.  

Short of building a fence around the geese or the plants, is there 
thing I can plant or a chemical I can apply that will discourage 
the geese from mutilating these other plants?

Webmaster at Imagine Hawaii