I've just moved into a house that has a large Phormium in the front garden. It has a faded flower spike on it. Do I need to cut this back, or should I leave it until the warmer weather?
Certified GKH Gardening Expert
You can optionally cut the flower spike back whenever you wish. Some gardeners find them attractive and leave them on the plant. However, once the spike produces seeds, they can drop and self-seed more Phormium in your yard, so you may want to remove the spike before the seeds mature.