I live in mid Kerry. I have a huge Gunnera manicata in my garden. It soaks up a lot of moisture and is an ‘architectural’ feature. However I spotted two samples growing in a neighbour’s drain last year. I have removed the seedheads from my specimen this year. I’M WONDERING SHOULD I remove my plant as I don’t want to leave an invasive plant as my legacy in the locality. What’s the best method please? I saw it in Kilmacura Gardens, Wicklow last week and was surprised.