Stolen plant is a delicate matter (3,6)

I believe the answer is:
hot potato
'a delicate matter' is the definition.
(I've seen this before)
'stolen plant' is the wordplay.
'stolen' becomes 'hot' (stolen goods are 'hot').
'plant' becomes 'potato' (I can't explain this - if you can you should believe this answer much more).
'hot'+'potato'='HOT POTATO'
'is' is the link.
Can you help me to learn more?
(Other definitions for hot potato that I've seen before include "Difficult matter" , "A difficult situation" , "that's controversial" , "Controversial/awkward issue" , "tricky issue?" .)
