How to Prune hyacinth 'Carnegie'?
No pruning required; cut spent flower stems back to the base

hyacinth 'Carnegie' · Hyacinthus orientalis 'Carnegie'
Grow in moderately fertile soil with good drainage. Will tolerate partial shade but will not flower as well as in full sun. Protect container-grown plants from hard frosts and excess wet. Specially treated bulbs can be grown indoors for earlier flowering. See hyacinth cultivation for more detailed advice
No pruning required; cut spent flower stems back to the base