"David Hill" wrote in message
You may find this site to be of use.
http://www.dahlias.net/dahwebpg/Cult...ex/Culture.htm

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And, if you live in the South you can leave them in the ground over winter
but do plant them deeper to start with and remember to use slug pellets next
spring or you won't see any shoots and will swear the frost got them.

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Regards
Bob

Some photos of my plants at.....