Posted: 29/08/2014 at 12:42
Hi Rosemary. When you say a huge container, just how big is it? Amelanchiers are usually fairly trouble free, but perhaps it's simply unhappy being in a container and is struggling with those conditions. Is it in an exposed, windy site where foliage is getting 'burned' ?
There may be another problem of course, like insect damage. Is there any chance you can post some pix? That will really help with further advice. Click on the tree icon in the toolbar and follow the instructions.