I have a Camellia Japonica which was not flowering in too small a pot, so last year I transferred it into the ground around June. As my soil is alkaline, I built a raised bed about 30cm deep and at least a metre wide, then filled it entirely with ericaceous compost, also working this into the soil below. All winter it has been producing plump green buds which then turn black and fail to open. We haven't had a particularly wet or frosty time here in the Midlands, so I'm not sure why this is happening. Would poor root conditions cause this e.g. if the depth of ericaceous soil isn't enough? Is it just stressed from the early Summer move? Any other rectifiable reason?