Divide clumps in spring about every 3 to 4 years.1
Keep in mind when planting that Dolce Creme de Menthe is thought of as very hardy, so this plant will survive though longer winters with little or no damage.By our calculations, you should look at sowing Dolce Creme de Menthe about 63 days before your last frost date.
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1 “Missouri Botanical Garden entry on Heuchera Dolce Creme de menthe”: http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=c926