Cordoned Blenheim apple trees
About two months ago I planted five apple trees in our small garden in Brighton. They're against a South facing wall so get plenty of sun.
Four of the five are growing nicely but one of them has no growth whatsoever and where the branches meet the main stem it's not looking so good - please see attached image.
Does anyone know what the problem is and if there is anythig I can do to bring the tree back to health?