Do Plums Go Bad? - Does It Go Bad?
Oct 11, 2019 · Plums develop their color as they ripen. Blue plums go from green to greenish-blue, then to dark blue. Purple plums go through a similar path, but end up purple instead of blue . Firmness. Similar to avocado, unripe plums are firm to the touch. Over time they soften, especially near the tip . That’s also the time they get their smell.