Startle fish then study where the blooming things go? (4,6)

I believe the answer is:

rock garden

'where the blooming things go?' is the definition.
(where flowers - things which bloom - might go)

'startle fish then study' is the wordplay.
'startle' becomes 'rock' (rock can mean to shock or startle).
'fish' becomes 'gar' (gar is a kind of fish).
'then' means one lot of letters go next to another.
'study' becomes 'den' (term for a study or office).
'rock'+'gar'+'den'='ROCK-GARDEN'

(Another definition for rock garden that I've seen is " horticultural feature".)

I've seen this clue in The Telegraph.

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