Top place for flower growing (10)

I believe the answer is:

roofgarden

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'flower growing' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'top place for' is the wordplay.
'top' becomes 'roof' (I've seen this before).
'place for' becomes 'garden' (I am not sure about this - if you are sure you should believe this answer much more).
'roof'+'garden'='ROOFGARDEN'

Can you help me to learn more?

I've seen this clue in The Irish Independent.

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