Sweetheart is a self-fertile cultivar which can be used as a "universal pollinator" for other cherry varieties with similar bloom time. The flowers bloom about 2-3 days before Bing. It is a very heavy producer, with overcropping being a potential issue. The tree is highly susceptible to powdery mildew.
Fruit characteristics
Sweetheart is a late-season cherry, ripening about 20-22 days after Bing cherries. The fruit is of moderatesize, with red flesh, and dark bright red skin.