Faience planter, any idea whose mark this is?

Id look towards Italy.

 

It looks French to me, Desvres Faïence, from NW France.

 

I don't know anything about authenticity, but the mark bears some resemblance to one of the marks of Desvres maker Fourmaintraux. Fourmaintraux was a family of ceramicists, so there are bound to be different marks.
Fourmaintraux mark:


https://www.infofaience.com/en/marks/desvres-marks

I turned your mark:

 

Upside down GG for Foumaintraux: https://www.infofaience.com/en/marks/desvres-marks You can find this same pot with Google Lens.

 

The same link I posted.

 

You are welcome to the credit.

 

How generous.

 

oh so those are Fs? Nice work there.

 

I didn't even notice the link, given that it's nestled immediately under the photo.

 

Not nestled. It is a line, the same size font as the other lines and the same distance, to show the source of the photo, and so people could check it out for themselves. If you look at other threads you'll see that it happens all over Antiquers.
Anyway, as you saw, it is there in post #4, and can be checked by those who are actually willing to look, as you were.