New Zealand Flax falling at sides
I have 4 New Zealand flax plants in my front garden. All of them seem to be falling over at the sides and I have no idea why. Other flax plants I've seen seem to have one large clump of leaves that spread out evenly around the sides. Mine seem to be very clumpy and spread all over each other (please see images below).
Does anyone have any idea why and what I can do to fix this? I'm tempted to cut them right back and dig up some of theclumps that are falling but don't want to damage the plant.