Green.
The Proto-Indo-European (PIE) word ghre-, meaning "to grow," is another root which endured the centuries. What grows? Green stuff! Grhe- gave us many modern words meaning "green," including English green, German grün, and Icelandic grænn, as well as the English words grow, grass, graze and herb. (here)
Know that the life of this world is but amusement and diversion and adornment and boasting to one another and competition in increase of wealth and children - like the example of a rain whose [resulting] plant growth pleases the tillers; then it dries and you see it turned yellow; then it becomes [scattered] debris. And in the Hereafter is severe punishment and forgiveness from Allah and approval. And what is the worldly life except the enjoyment of delusion.
--- The Holy Qur'an [57:20]
