To have green fingers is to be very good at making plants grow. She must have green fingers.
It is the British form, and Americans say a green thumb. It credits a gift rather than the reading and patience that actually do it.
1phrasehave green fingersTo be very good at making plants grow.
“Anybody with a garden like that must have green fingers.”
have green fingers is a phrase.
Also accepted in games: green thumb, green fingers
Practised in Idioms