Hardiness variablesdate of freezing--research

• Aquilegia and Dianthus more hardy Jan. 1 than Nov. 15 (Herrick, 1995)

• Geranium ‘Biokovo’ (Meyer, 2000)

  • 50% died in Sept. at 32F
  • 50% died in Jan. at -10F
  • similar trend with Sedum (Iles, ISU)

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