We have an Acer palmatum 'Sango-kaku' in a container. It is about 2
metres tall and is in well drained JI No. 3. The container is located
in a quite sheltered place in an area that receives full sun from mid
morning to early afternoon.

From Spring until late Summer it looked splendid, not exhibiting any
signs of problems apart from occasional very minor leaf scorch. During
the last few weeks, as the leaves stated to change colour, virtually all
of them have become very scorched looking and black before falling.

We have not had a great deal in the way of inclement weather in recent
weeks and it is still quite warm here in S Devon.

Grateful for any thoughts as to probable causes.
--
Robert