green thumb 
noun
North American term for green fingers.If you have a green thumb and a bit of spare time maybe you should think about putting on the gardening gloves and becoming involved in the community gardens....
- For those of you without a green thumb, I have the perfect spring tonic - wildflower walks.
- If you have a green thumb, why not provide lawn care for some of your neighbors?
Derivatives
green-thumbed
- Simon Tiffin is the editor of the hip men's magazine Esquire and typical of the new breed of green-thumbed city-dwellers.
- We live in a disposable society, but most green-thumbed people are keen recyclers and baulk at one-use wonders.
- Small-space gardening has always been a challenge for green-thumbed owners of condo courtyards, apartment balconies and lot-line back yards.