On 13-Oct-12, at 9:05 PM, Colleen wrote: > I would like to know who may have had the coldest successful > overwinter in > the ground with Dahlias. Did you add a mulch. I don't mulch - no need to encourage slugs. My dahlias have done fine to -8 C. We might have been down to -12 one year. I'll just google to see what that is in F. OK. -8 C = 17.6 F My ground does not freeze. Diane Whitehead Victoria, British Columbia, Canada cool mediterranean climate moderate dry summers, moderate rainy winters 68 cm rain (27 in)