Prunus cerasus Morello
Smaller than its sweet cousins, the Morello cherry trees is self-fertile and crops heavily in most parts of the country. Morello cherry trees tolerates colder and wetter conditions than the sweet cherries. The cherries are pickable from the time their skin is dark red. At this stage, Morello Cherries are sour and should be cooked - they make great cherry trees jam. However if a Morello cherry trees is left on the tree into August - by which time its skin will be practically black it will be edible off the tree in the same way that a tart eating apple is. Morello cherry trees is self-fertile and grows well against walls including north facing ones - it takes more shade than a sweet cherry trees such as Stella. All sour cherries fruit carry next years fruit on this year's new growth so prune hard to encourage new wood, without removing all of this year's development. As with all cherries, prune Morello cherry trees trees in summer to avoid bacterial infection of the cuts.
If you are unclear about fruit tree sizes take a look at our Guide to Fruit Tree Sizing