They can be grafted onto each other and, when cross-pollinated, produce seeds that become Duke hybrid cultivars.
Sweet cherries are more difficult to produce than tart.
They are scarcely more hardy than peaches, bloom early, and thus are frequently caught by spring frosts. Many sweet cherry cultivars experience severe cracking if water is allowed to remain on the skin for a few hours before harvest. Rains at harvest time will often ruin a crop. Recent testing of antitransparents has shown them to have promise in reducing cracking. Many common cultivars were originally developed in Europe and brought to this country.