The Superior Plum trees is a Japanese variety selected for it's large size, vigor, and hardiness.The Superior is a good variety for cold regions. It will bear fruit early. The Superior fruit is fire red with yellow flesh, ripening the first days of August. It is a great pollinator for other Japanese plum varieties. Superior requires another Japanese plum for pollination. Wiith this plum tree, you have a tree that bears earlier and heavier than most plum trees. The fruit ripens in August-September. A good plum tree for Zone 4.