The Mount Royal Plum is a popular, hardy variety known for producing some of the best blue plums. In spring, clusters of showy white flowers give way to small to medium-sized blue plums in late August or early September. These plums are perfect for eating, canning, pies, and other baked goods. A heavy producer, this self-pollinating tree requires just one plant to yield fruit. With both ornamental beauty and edible fruit, the Mount Royal Plum is an easy choice for any landscape.