The most common and most likely answer to this crossword clue is the 9 letter word RESEEDING
R
E
S
E
E
D
I
N
G
More clues leading to the result RESEEDING
Buddy explains!

The straight part
We know that "planting again" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case planting again = reseeding.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does RESEEDING mean?
RESEEDING verb- To sow seeds again; to resow or replant.
- Of a non-perennial plant, to produce seeds to ensure the following generation without human intervention; to self-sow.
- To reset the input of an algorithm so as to ensure different results.