Info attached to cane carrying mature plant (9)
I believe the answer is:
goldenrod
'plant' is the definition.
The answer is an example.
'info attached to cane carrying mature' is the wordplay.
'info' becomes 'gen' (gen is a kind of info).
'attached to' means one lot of letters go next to another.
'cane' becomes 'rod' (I've seen this before).
'carrying' indicates putting letters inside.
'mature' becomes 'old' ('old' is associated in meaning with 'mature').
'gen'+'rod'='genrod'
'genrod' going around 'old' is 'GOLDENROD'.
(Other definitions for goldenrod that I've seen before include "Yellow-spiked garden flower" , "bloomer" , "Plant with tall spikes of yellow flowers" , "Tall-spiked plant" , "Yellow-headed garden plant" .)