On Sat, 23 Jun 2012 05:16:47 -0700 (PDT), 66oldgit
wrote:

Hi, seem unlucky with these on my heavy soil, so can anyone advise me so I can keep them for next year, and hopefully longer thanks

I assume you mean border phlox not the alpine type.
I have a basic clay soil.
I have no trouble with the former, and find they take easily from
divisions. The alpine types of phlox I cannot manage to keep
overwinter. They never seem to survive.

Pam in Bristol