How to Prune New Zealand bur?
Pull out rooted stems to restrict its spread

New Zealand bur · Acaena microphylla
Also known as: New Zealand burr; rosy-spined New Zealand bur
This plant is listed on Schedule 9 of the UK Wildlife & Countryside Act (Northern Ireland) as an invasive non-native species. Although not banned from sale, it is an offence to plant or cause these to grow in the wild IN NORTHERN IRELAND Gardeners possessing them should undertake measures to control them. See RHS advice on invasive non-native species for further information
Pull out rooted stems to restrict its spread