From Longman Dictionary of Contemporary Englishherbaceous borderherˌbaceous ˈborder noun [countable] DLGpart of a garden where people grow plants that live for many years and do not need to be replaced
Examples from the Corpus
herbaceous border• Useful for June/July flowering in the herbaceous border.• But he was smiling as they helped him out of the herbaceous border.• Excellent way to add fragrance to the herbaceous border in June and July. 