Hi all, complete novice gardener here. We've got a flaming silver Pieris, it's not doing so well. Tips are brown, leaf fall, some red leaves and new growth but not really going the darker green we thought they should. Being novices we hadn't realised we needed ericaceous compost but it's been in that for 2+ months now and having ericaceous feed. Any ideas how to get this thriving? It will be planted out when we have figured out what we're doing with the masaive project garden we've now got. Once the project house is sorted. Thanks for your help