Posted: 10/04/2016 at 17:35
a couple of things.......when you tidied up did you cut it a little bit harder at the back? And is the back in relative shade?...i.e. Does it get much sunlight?
these hebes are best grown in 2 ways....pruned every year. And pruned to a mounded shape so that light and moisture can get to bottom of the shrub. At least its how I grow the dwarf varieties.
most often than not hebes do not respond well to hard pruning....they can but usually sulk....so regular annual pruning is good
take cuttings though in mid spring.