The vegetable is hard to propagate (6)

I believe the answer is:

radish

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'the vegetable' is the definition.
(radish is a type of vegetable)

'is hard to propagate' is the wordplay.
'is hard' anagrams to 'RADISH'.
But, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for radish that I've seen before include "Hottish salad plant" , "Root eaten raw in salads" , "3 down" , "Root vegetable used in salads" , "Sir had this vegetable" .)

I've seen this clue in The Globe and Mail.

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