Grandpa's son cultivated flowers (11)

I believe the answer is:

snapdragons

'flowers' is the definition.
(snapdragon is a kind of flower)

'grandpa's son cultivated' is the wordplay.
'cultivated' is an anagram indicator.
'grandpas'+'son'='grandpasson'
'grandpasson' is an anagram of 'SNAPDRAGONS'.

(Other definitions for snapdragons that I've seen before include "bloomers" , "Flowers" .)

I've seen this clue in the Sydney Morning Herald.

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