A person with a green thumb seems to have a magic touch that makes plants grow quickly and well.
VOA: special.2010.05.23
Back in the 1970s and 80s Subbuteo could probably be found in many boys' bedrooms, yet as computerised football games grew the magic of flicking those little plastic figures around a green pitch seemed to fade, and indeed its availability has been off and on for many years, until a re-launch at the 2012 London Toy Fair.