We have a well established bank of Anemone - Honorine Jobert. It grows on a very steep wall/rockery. Last summer I noticed that some of the leaves on the plants began to yellow and in turn went brown & died. I thought that this might be due to all the rain we had in 2012. This year the same thing has happened but it is more prolific. I've tried feeding it but it is quite difficult to get to the soil between the rocks. It has been established since I bought our house 14yrs ago. Any suggestions as to why this is happening now and what I can do to rectify it?