ACERS In Pots

Question

I POTTED MY NEW ACERS INTO LARGE POTS TEN WKS AGO THINGS HAVE GONE FINE UNTIL LAST WK WHEN I NOTICED THE LEAVES TUNRNING BROWN THEY ARE YOUNG TREES AND ARE IN A SUNNY POSITION COULD THIS BE CAUSING THE PROBLEM OR IS IT SOMETHING MORE SINISTER ,

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Answer 1

This looks more like an issue with overly wet soils. Soil will need a chance to dry out down to about 5-8 cm, thoroughly, between waterings.

I would apply a fungicide, and make sure to measure soil moisture if you are unsure of whether it is time to water or not.

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm

https://www.gardeningknowhow.com/ornamental/trees/japanese-maple