Posted: 13/02/2015 at 10:47
Epsom salts are magnesium sulphate. Have never used it myself so cannot help there.
Ashwoods feed their Hellebores in their display garden when the leaves of the x orientalis types begin to lie down, ie Autumn to late Winter. They feed with chicken pellet. Myself I use Growmore, but then our soil is very rich to begin with.
If your plants do not want to flower then you could try a Tomato type fertiliser (info on the container about dilution rates), again in Autumn or late winter.
By the way our soil is a peaty silt. The lime in it comes from the contamination by lime mortar from some Georgian cottages which were on site and allowed to fall down.
Harveys Garden plants is in Suffolk, that have a good range or so I am told.
Most decent garden centres stock Hellebores at this time of year.