Kate, couple of years ago I had 2 Forest Flame which had been in a small front garden for 2 years. The second year they both started to droop and the leaves were discoloured. I dug both up, left them in a bucket of water for a couple of hours and transplanted them in the back garden with a handful of bonemeal mixed in. The new site had deeper soil and it had added rough garden compost. I gave both a good watering once transplanted. They both sulked and drooped for about a month and then took on a new life and have been doing really well ever since. There's another thread where someone asks about feeding them but no responses on that as yet I think which would be good to know. I hope you get some expert advice because they are such lovely plants. Sorry this doesn't directly answer your question but would be interested to hear what the experts think.