Green = righteousness; envy; peace and prosperity. It shows life, growth and zealousness. It is fruitful *or* fruitless!
Psalm 92:12 The righteous shall flourish like the palm tree: he shall grow like a cedar in Lebanon.
Mark 11:13 And seeing a fig tree afar off having leaves, He came, if haply He might find anything thereon: and when He came to it, He found nothing but leaves; for the tie of figs was not yet.