How to Prune astelia 'Red Devil'?
Remove or trim winter-damaged foliage in spring

astelia 'Red Devil' · Astelia 'Red Devil'
Grown in moist, but reasonably well-drained, fertile, peaty soil in full sun or partial shade and a sheltered spot. The foliage can be damaged by frost and prevailing cold winds. It may need winter protection
Remove or trim winter-damaged foliage in spring