Promising gardening correspondent? (7,6)

'promising gardening correspondent?' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'promising gardening correspondent?' is the wordplay.
I cannot really understand how this works, but
'promising' could be 'budding' (as in a budding young artist) and 'budding' is found in the answer.
'correspondent?' could be 'author' (correspondent is a kind of author) and 'author' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?