Posted: 01/01/2015 at 16:15
your compost? Is it mpc ericaceous? John Innes ...soil based...ericaceous is better in pots
skimmias hate strong sun and alkaline soil. Perhaps you have been watering with tap water too?
for me skimmias prefer being in the ground....some moisture, some shade, neutral to acid soil and not overly exposed to strong winds. Currently I do not grow them...removed to plant more perennials.....but that's the way I grew them. For a friend I have them planted in conditions I have described and they look good.
rather than looking at "ferrous" treatments I think it better to look at growing conditions.