Plants bordering new gardens? These might come out for purchase in winter? (9)

I believe the answer is:

snowshoes

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'these might come out for purchase in winter?' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'plants bordering new gardens?' is the wordplay.
'plants' becomes 'sows' (sow can mean to plant seeds).
'bordering' is an insertion indicator.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'gardens?' becomes 'hoes' (I've seen this in another clue).
'sows' going around 'n' is 'snows'.
'snows'+'hoes'='SNOWSHOES'

Can you help me to learn more?

I've seen this clue in The Guardian.

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