There is a sentence I don't quite understand.

I saw a sentence which was "I'm proud of my sister's green thumb, but the dirt under her jfingernails is embarrassing."

What does GREEN THUMB mean? I think it is a idiom or slang which I don't get it.

What does the whole sentens mean with the GREEN THUMB?

Thank you.

'She has a green thumb' means that she is good at gardening, good with plants.

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Hi Clive
Thanks a lot.
it is a idiom but i don't know what it means
Read the rest of this thread and then you will know!
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