Summer Sun is an English cherry, partially self-fertile, but it crops better when it has a pollinator (Lapins, Merton Glory, Morello, Stella). It is particularly good for the UK because it crops well even if weather is not very good in summer. This variety is suitable for the North in a sheltered position.
Summer Sun flowers in April and May, and the sweet and tasty fruit ripens to dark red in late June/early July. The tree is good as a bush shape, but also ideal for fan training against a south-facing wall.