Sour and sweet cherries can be grown in Delaware.
Sour cherries are more likely to produce a crop.
Normally, trees will live 15 to 20 years before they become unproductive. Sour cherries do not require cross-pollination. Some sweet cherries require at least two varieties to be productive. Some of the newer varieties do not need cross-pollination, but will usually produce more fruit when they are. If space is limited, consider planting the new bush-type cherries.