Plant damaged — blame me on replacing 'earth' with 'live' (5,4)
I believe the answer is:
lemon balm
'plant damaged blame' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'me on replacing earth with live' is the wordplay.
'replacing' indicates an anagram (placing again).
'earth' becomes 'balm' (I can't explain this - if you can you should believe this answer much more).
'with' means one lot of letters go next to another.
'live' becomes 'l' (electrical abbreviation).
'me'+'on'='meon'
'meon' anagrammed gives 'emon'.
'emon'+'balm'='emonbalm'
'emonbalm' put after 'l' is 'LEMON BALM'.
Can you help me to learn more?
(Another definition for lemon balm that I've seen is " Bushy scented herb".)