Recall my stroll gathering old aromatic plant (9)

'aromatic plant' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Maybe there's a link between them I don't understand?

'recall my stroll gathering old' is the wordplay.
'recall' shows that the letters should be reversed in order.
'my' becomes 'cor' (both are expressions of surprise).
'stroll' becomes 'amble' (synonyms).
'gathering' means one lot of letters goes inside another (gather can mean to acquire or bring in).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'cor' back-to-front is 'roc'.
'amble' placed around 'o' is 'ambole'.
'roc'+'ambole'='ROCAMBOLE'

Can you help me to learn more?