Runners grown in your garden (7)

I believe the answer is:

flowers

I'm a little stuck... Click here to teach me more about this clue!

'garden' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

(Other definitions for flowers that I've seen before include "Blossoms" , "Blooms" .)

I've seen this clue in the Evening Standard.

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