So shrub round the middle of the bed becomes a popular garden feature (4,4)

I believe the answer is:

rose bush

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'round the middle of the bed becomes a popular garden feature' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'so shrub' is the wordplay.
'so' becomes 'rose' (I am not sure about this - if you are sure you should believe this answer much more).
'shrub' becomes 'bush' (synonyms).
'rose'+'bush'='ROSE-BUSH'

Can you help me to learn more?

(Another definition for rose bush that I've seen is " Garden plant".)

I've seen this clue in The Irish Independent.

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