green fingers 
plural noun British informal
Natural ability in growing plants: you really do have green fingers orchids are the supreme test for green fingers...
- Running a garden centre requires special skills, and is also very labour intensive as anyone with green fingers will know.
- The sunny south-westerly garden should appeal to those with green fingers.
- Hemant himself loved gardening and was born with green fingers.
Derivatives
green-fingered
- The arts and craft fair committee want green-fingered villagers to contribute to the plant stall by growing seeds or taking cuttings.
- This is one of the hardiest house plants known to man or woman, which should endear it at once to everyone who isn't green-fingered.
- Organisers hope green-fingered gardeners will be hard at work to ensure that come July, the borough is blooming.