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Damage on leaves of Rhododendrons / Winter -02 .. -03
Min Temp -26°C

Damage on Rhododendrons checked on 08-May-2003. The list does not include all of the species or smaller plants in my garden.



Without protection ilman_suojaa.gif (823 bytes)
Wind shield tuulensuoja.gif (882 bytes)
Loose shield w fir branches harva_havu.gif (877 bytes)
Dense shield w fir branches tihea_havu.gif (893 bytes)
Cold Frame kylmalava.gif (854 bytes)

No damage or very little damage on leaves (0 to 5 %)
Hybrid or Cultivar Name Hardiness Protection Damage Comments
'Frost Hexe' -23C tihea_havu.gif (893 bytes) 0 % New planting. Probably hardier than -23°C
'Goldbukett' -24C harva_havu.gif (877 bytes) 0 % In shade -27°C.
'Puncta' -26C harva_havu.gif (877 bytes) 0 % New planting
'Lauretta' -27C harva_havu.gif (877 bytes) 0 % New planting
'Falling Snow' -28C harva_havu.gif (877 bytes) 0 %  
'Mist Maiden' -28C tihea_havu.gif (893 bytes) 0 % New planting
'Catawbiense Grandiflorum' -30C ilman_suojaa.gif (823 bytes) 0 %  
P.J.Mezitt' -30C tuulensuoja.gif (882 bytes) 0 %  
P.J.Mezitt' -30C ilman_suojaa.gif (823 bytes) 0 %  
'Elviira' -34C harva_havu.gif (877 bytes) 0 %  
'Hellikki' -34C ilman_suojaa.gif (823 bytes) 0 % New planting in shade
'Kullervo' -34C tuulensuoja.gif (882 bytes) 0 %  
'Kullervo' -34C tihea_havu.gif (893 bytes) 0 % New planting
'Pekka' -34C tuulensuoja.gif (882 bytes) 0 %  
'Haaga' -36C ilman_suojaa.gif (823 bytes) 0 %  
'P.M.A. Tigerstedt' -36C tuulensuoja.gif (882 bytes) 0 %  
'St. Michel' -37C tuulensuoja.gif (882 bytes) 0 %  
'Catawbiense Grandiflorum' -30C tuulensuoja.gif (882 bytes) 1 %  
'Catawbiense Grandiflorum' -30C tuulensuoja.gif (882 bytes) 1 %  
'Pekka' -34C tuulensuoja.gif (882 bytes) 1 %  
'Django' -26C harva_havu.gif (877 bytes) 2 % New planting
'Hachmann's Charmant' -26C harva_havu.gif (877 bytes) 2 %  
'Ken Janeck' -26C harva_havu.gif (877 bytes) 2 %  
'Isola Bella' -27C tihea_havu.gif (893 bytes) 2 %  
'Falling Snow' -28C harva_havu.gif (877 bytes) 2 %  
'Jens Jörgen Sörensen' -28C tihea_havu.gif (893 bytes) 2 % New planting
'Catawbiense Grandiflorum' -30C ilman_suojaa.gif (823 bytes) 2 %  
'Catawbiense Grandiflorum' -30C ilman_suojaa.gif (823 bytes) 2 %  
'Kullervo' -34C harva_havu.gif (877 bytes) 2 % New planting
'Haaga' -36C ilman_suojaa.gif (823 bytes) 2 %  
'Yaku Angel' -24C tihea_havu.gif (893 bytes) 3 % New planting
'Roseum Elegans' -32C ilman_suojaa.gif (823 bytes) 3 % New planting
'Helsinki University' -39C tuulensuoja.gif (882 bytes) 3 % Weakened by insects in summer.
'Sonatine' -24C tihea_havu.gif (893 bytes) 4 %  
'Matterhorn' -26C harva_havu.gif (877 bytes) 4 %  

Some damage on leaves (5 to 10 %)
Hybrid or Cultivar Name Hardiness Protection Damage Comments
'Calsap' -26C harva_havu.gif (877 bytes) 5 %  
'Ramapo' -28C tihea_havu.gif (893 bytes) 5 % New planting
'Catawbiense Grandiflorum' -30C ilman_suojaa.gif (823 bytes) 5 %  
'Catawbiense Grandiflorum' -30C ilman_suojaa.gif (823 bytes) 5 %  
'Manitau' -26C harva_havu.gif (877 bytes) 6 %  
'Blumiria' -27C harva_havu.gif (877 bytes) 6 %  
'Gradito' -28C harva_havu.gif (877 bytes) 6 %  
'Cunningham's White' -22C ilman_suojaa.gif (823 bytes) 10 % Flower buds dead.
'Sneezy' -23C harva_havu.gif (877 bytes) 10 % New planting
yakushimanum 'Koichiro Wada' -24C tihea_havu.gif (893 bytes) 10 %  
yakushimanum 'Koichiro Wada' -24C tihea_havu.gif (893 bytes) 10 % New planting
dichroanthum 'Böhmen' -25C tihea_havu.gif (893 bytes) 10 % New planting
'Oktavia' -25C tihea_havu.gif (893 bytes) 10 % New planting
'Capistrano' -26C harva_havu.gif (877 bytes) 10 % New planting
'Edelwei' -26C tihea_havu.gif (893 bytes) 10 % New planting
'Hellikki' -34C tuulensuoja.gif (882 bytes) 10 % New planting

Considerable damage on leaves (15 .. 30 %)
Hybrid or Cultivar Name Hardiness Protection Damage Comments
'Brigitte' -24C harva_havu.gif (877 bytes) 15 % New planting, flower buds dead.
'Nova Zembla' -25C tuulensuoja.gif (882 bytes) 15 % Old leaves are dying and most flower buds.
'Catawbiense Grandiflorum' -30C tuulensuoja.gif (882 bytes) 15 % Young plant on dry place.
'Pohjolan Daughter' -34C tuulensuoja.gif (882 bytes) 15 % Flower buds mostly dead.
'Roseum Elegans' -32C tuulensuoja.gif (882 bytes) 20 % New planting on dry place.
'Pohjola's Daughter' -34C tuulensuoja.gif (882 bytes) 20 % Flower buds mostly dead.
'Cunningham's White' -22C ilman_suojaa.gif (823 bytes) 25 % Flower buds dead.
'Scarlet Wonder' -22C tihea_havu.gif (893 bytes) 30 % Previous winter (-21C) no damage.

A lot of damage on leaves (50 .. 100 %)
Hybrid or Cultivar Name Hardiness Protection Damage Comments
'Pearce's American Beauty' -26C harva_havu.gif (877 bytes) 50 % Previous winter (-21C) no damage on leaves, but flower buds dead.
'Dagmar' -27C harva_havu.gif (877 bytes) 65 % Previous winter 95 % damage on leaves.
'Robert Seleger' -21C harva_havu.gif (877 bytes) 70 % Previous winter the plant was better protected
'Caramba' -24C harva_havu.gif (877 bytes) 70 % Previous winter (-21C) only 10 % damage on leaves.
'Kalinka' -25C harva_havu.gif (877 bytes) 70 % This seems to happen every winter, but flower buds are still OK!
'Gartendirektor Glocker' -20C tihea_havu.gif (893 bytes) 100 % New planting. The plant died.
'Wilgen's Ruby' -23C harva_havu.gif (877 bytes) 100 % New planting. Previous winter the plant was in cold frame. New growth started from the roots in July.
keiskei 'Yaku Fairy' -23C tihea_havu.gif (893 bytes) 100 % New planting. Previous spring had suffered from frost. The plant died.
'April Gem' -26C harva_havu.gif (877 bytes) 100 % Previous winter (-21C) no damage on leaves. The plant died.