In English-speaking regions, having a (or being "green-fingered" in the UK) refers to a person with a natural talent for growing plants. A "mature" gardener with this skill is often celebrated in British heritage for maintaining traditional cottage gardens or allotment plots. 2. Heritage English Varieties
There are several English heritage plants that have specific names, though none are "mature thumbs." You may be thinking of: english mature thumbs
: Significant features of the English Countryside , such as ancient oaks or mulberries. In English-speaking regions