If you have questions please contact the Nursery Program, 65. This list is annually reviewed and updated each September. If the cultivar is not listed refer to the species for appropriate cold hardiness zone. Particularly if the cultivar varies in hardiness from the species. However, plants that are not labeled for cold hardiness and are not cold hardy in the area in which they are being sold must be labeled "nonhardy".Ĭultivars are listed separately if supporting information has been presented. If the correct cold hardiness is on the label nothing further is needed. If cold hardiness labeling is present, it must be consistent with this list. All nonhardy nursery stock as designated by the commissioner must be labeled correctly for hardiness or be labeled "nonhardy" in Minnesota.Plants, plant materials, or nursery stock must not be labeled or advertised with false or misleading information including, but not limited to, scientific name, variety, place of origin, hardiness zone as defined by the United States Department of Agriculture, and growth habit.This list will be used to identify false or misleading USDA cold hardiness zone labeling of plants offered for sale which is a violation of Minnesota Statute 18H.14. Cold Hardiness List 2023 UPDATED for the 2023 season.
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