Morello cherry is a large dark red sour or cooking cherry with its distinctive acid flavour.  Too sour to be eaten, Morello is used in the cooking of pies jams and preserves.
It is a hardy, self-fertile cherry that can be grown on a north facing wall which has very good disease resistance. Morello cherry trees fruit on younger wood than the sweeter varieties allowing them to be pruned harder. Sour cherries are not good pollinators for sweet cherries.
Cropping is from late July until early August.

Pruning of Plums and Cherries
Due to the risk of silver leaf in plums gages damsons and cherries always prune in early spring to mid-summer never in the winter like apples and pears.

Cherry Morello