How to Prune blue fescue 'Blue Select'?
Comb out dead foliage and trim damaged parts of older leaves in spring

blue fescue 'Blue Select' · Festuca glauca 'Blue Select'
Grow in poor to moderately fertile, well-drained soil in full sun. Clumps tend to die out in the middle, so ideally divide every three years. Further ornamental grasses cultivation advice
Comb out dead foliage and trim damaged parts of older leaves in spring