“What is small, red and whispers?”/“A hoarse radish.”

A popular joke about horseradish is:
 
Q: What is small, red and whispers?
A: A hoarse radish.
 
The joke was cited in he newsgroup uk.rec.gardening in 1997.
 
 
Google Groups: uk.rec.gardening
Gardening Humour
David Bridges
5/2/97
(...)
What is small, red and whispers?
A hoarse radish.
   
Twitter
Dan Schaumann
‏@danschaumann
@SarahPsyDeal What’s small, red and whispers? A hoarse radish!  (sorry)
11:15 AM - 27 Aug 2009
 
Twitter
Annie the Bloodhound
‏@BloodhoundNdots
What is small, red and whispers?  A hoarse radish. #pawpawty
8:58 PM - 26 Sep 2009
 
Google Books
A Man Walks Into a Bar 3
By Jonathan Swan
New York, NY: Ebury Press (Random House)
2010
Pg. 159:
What is small. red and whispers?
A hoarse radish.
 
Google Books
The Mammoth Book of One-Liners
By Geoff Tibballs
London: Constable & Robinson Ltd.
2012
Pg. ?:
What is small, red and whispers?
A hoarse radish.
   
Google Books
5,000 Great One Liners
By Grant TUcker
London; The Robson Press
2012
Pg. ?:
What is small, red and whispers?
A hoarse radish.
 
Google Books
101 Amazing Food Jokes
By Jack Goldstein
Andrews UK Limited
2013
Pg. ?:
What is small, red and whispers?
A hoarse radish!