They could be blooming nice vegetables (5,4)

I believe the answer is:

sweet peas

'they could be blooming' is the definition.
(type of flower)

'nice vegetables' is the wordplay.
'nice' becomes 'sweet' (both can mean agreeable or pleasant).
'vegetables' becomes 'peas' (I've seen this before).
'sweet'+'peas'='SWEET PEAS'

(Another definition for sweet peas that I've seen is " Plants".)

I've seen this clue in The Telegraph.

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