She has a green thumb

A good rule of thumb

The green thumb is equable in the face of nature's uncertainties; he moves among her mysteries without feeling the need for control or explanations or once-and-for-all solutions. To garden well is to be happy amid the babble of the objective world, untroubled by its refusal to be reduced by our ideas of it, its indomitable rankness.

My green thumb came only as a result of the mistakes I made while learning to see things from the plant's point of view.

If you wish to make anything grow, you must understand it, and understand it in a very real sense. 'Green fingers' are a fact, and a mystery only to the unpracticed. But green fingers are the extensions of a verdant heart.

I have a green thumb. I really like to get into the shrubs, the bushes, and really cultivate.