Frost Tolerances
After a 28F temperature at 8:00 am on October 9 in Fargo, notes were taken on how the plants reacted to the temperature. The following table shows which plants had no damage, which had less than 50% damage, which had more than 50% damage and which had 90-100% damage. Only the genus is listed unless there was a definite difference between cultivars or species within a genus.
Frost Tolerances - Fargo Trial Garden
Low tolerance (90-100% damage) Low-medium tolerance (>50% damage) Medium-high tolerance (<50% damage) High tolerance (0% damage)
Begonias Alternanthera Ageratum Abutilon
Celosia Capsicum 'Explosive Ember' Asclepias Agastache
Cosmos Catharanthus Capsicum 'Chilly Chili' Antirrhinum
Helianthus Cleome Cardiospermum Asarina
Hypoestes Ipomoea (Cypress Vine) Cobaea Chrysanthemum
Impatiens Ipomoea 'Heavenly Blue' Incarvillea Dianthus
Ipomoea (Cardinal Climber) Ipomoea 'Minibar Rose' Malope Dracaena
Ipomoea (Firecracker Vine) Lablab Monarda Eucalyptus
Kochia Limonium Pelargonium - Zonals Eustoma
Melampodium Pennisetum glaucum Tagetes Fuchsia
Ocimum Phaseolus Tithonia Gaillardia
Portulaca Torenia Tropaeolum Gazania
Salvia coccinea     Gypsophila
S. splendens     Helichrysum
Spilanthes     Kniphofia
Zinnia     Lavandula
      Lobularia
      Nicotiana
      Nierembergia
      Osteospermum
      Pelargonium - Exoticas, Cascades
      Pennisetum seteceum
      Petunias
      Rudbeckia
      Salvia farinacea
      S. patens
      Sanvitalia
      Scabiosa
      Stipa
      Trachelium
      Verbena
    Viola