making a photo more "green"

Let's say I have a photo of a "wilderness" area that doesn't have much
wilderness. I have some forestry areas, that are a lovely shade of
green, but I have some open pasture areas area drab brown and a little
magenta. This photo is an aerial photo of a project I'm working on, but
the photo looks, in a word, "ugly". I want to make the desert/pasture
areas more green, but I'm having a problem getting the desired effect.

I have tried levels, to try to make it the photo more green.
I have tried curvers to try to make it more green.

Both techniques haven't been able to do exactly what I'm looking for.
Considering the photo is 400 megs and 1 foot pixels, it's hard to work
with, but i got a little time before deadline. The resolution of the
photo is perfect for me.

Any ideas out there?

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