Stun factory, displaying alyssum, for example (4,5)

I believe the answer is:

rock plant

'alyssum for example' is the definition.
(alyssum is a rock plant)

'stun factory' is the wordplay.
'stun' becomes 'rock' (both can mean to shock).
'factory' becomes 'plant' (I've seen this before).
'rock'+'plant'='ROCK-PLANT'

'displaying' is the link.

(Another definition for rock plant that I've seen is " Alpine".)

I've seen this clue in The Times.

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