Update! I went to GWL and met David Hurrion who has lots of expertise on this.He said to cut it back by half in order to remove their food source, and expose all surfaces to the cold of winter, and predators. He said that will work as long as the neighbours don't have it. However, I've discovered viburnum in the common area which will probably go uncontrolled, so I've pulled it all out. Oh well, new opportunities
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