It would not change the color and it would not grow anymore. The cell wall is the outside layer of a plant, so if it eventually breaks off for some reason, it cannot grow anymore. Some plants can survive if their cell wall broke off, like a cactus. Cactuses can keep growing because it can be tall or short. (if someone like cut it in half or something, the cactus can still grow) Cactus does not have any leaves or anything connected to it (except for thorns) and if you break it, it can still grow.
