Thanks all.
Okatar, I've taken to using terragen's grass patch as a base, adding grass clumps made in speedtree, Dune's heather and some dead stuff made in speedtree for most of my mountain pics. I have some blueberries I sometimes use but they did not seem needed here.
DocCharly65 the British mountains are my second home, I live in the peak district so that I can easily access them.