R Script Colour Brewer

Hi Guys, 

I created an area graph, for 32 unique names. the main issue i'm having, is that whenever i try to make scale_fill_brewer(palette="Greens"), to work  - it only colours 8 of the names, and leaves the rest of the names white.

what i want is a way to shade the names into 32 unique shades of green automatically ( i cant just list 32 different greens, because if i add another name into the list, i dont want to go back in and edit the R-Script code).