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The plant pathogen <i>Dickeya solani</i> causes soft rot and blackleg diseases in several crops including <i>Solanum tuberosum</i>. Unveiling the patterns of its diversity contributes to understanding the emergence and virulence of this pathogen in potato agro-systems. In this study, we analyzed the genome of several <i>D. solani</i> strains exhibiting an atypically high number of genetic variations. Variant calling and phylogenomics support the evidence that the strains RNS10-105-1A, A623S-20A-17 and RNS05.1.2A belong to a divergent sub-group of <i>D. solani</i> for which we proposed RNS05.1.2A as a reference strain. In addition, we showed that the variations (1253 to 1278 snp/indels) in strains RNS13-30-1A, RNS13-31-1A and RNS13-48-1A were caused by a horizontal gene transfer event from a donor belonging to the <i>D. solani</i> RNS05.1.2A subgroup. The overall results highlight the patterns driving the diversification in <i>D. solani</i> species. This work contributes to understanding patterns and causes of diversity in the emerging pathogen <i>D. solani.</i>