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USDA Hardiness Planting Zones

To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

  • If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
  • If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).
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  1. Remove This Item Bloom Season: Early - Mid Summer
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  1. $16.98

    Sale: $8.49

    Per Bag of 3

    Swamp Milkweed Cinderella’s vanilla scented flowers are a treat for the senses. Deep pink petals with white centers bloom in 2” wide clusters. Compact in form, Cinderella will make an excellent choice for a small sunny garden, and will perform well in low spots or moist areas. Support the Monarchs with Milkweed by providing a valuable food source and shelter. (Asclepias incarnata) Learn More →

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