How to Prune daffodil 'Trigonometry'?
Deadhead as flowers fade and allow the leaves to die down naturally

daffodil 'Trigonometry' · Narcissus 'Trigonometry'
Plant at one and a half to two times its own depth in autumn. Will tolerate most soils but prefers moderately fertile, well-drained soil that is constantly moist during the growing season. See daffodil cultivation
Deadhead as flowers fade and allow the leaves to die down naturally