Paluu dokumenttiluetteloon  /  Back to the catalogue of various documents on rhododendrons

---

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
Wind shield
Loose shield w fir branches
Dense shield w fir branches
Cold Frame

No damage or very little damage on leaves (0 to 5 %) Hybrid or Cultivar Name Hardiness Protection Damage Comments 'Frost Hexe' -23°C 0 % New planting. Probably hardier than -23°C 'Goldbukett' -24°C 0 % In shade -27°C. 'Puncta' -26°C 0 % New planting 'Lauretta' -27°C 0 % New planting 'Falling Snow' -28°C 0 %   'Mist Maiden' -28°C 0 % New planting 'Catawbiense Grandiflorum' -30°C 0 %   P.J.Mezitt' -30°C 0 %   P.J.Mezitt' -30°C 0 %   'Elviira' -34°C 0 %   'Hellikki' -34°C 0 % New planting in shade 'Kullervo' -34°C 0 %   'Kullervo' -34°C 0 % New planting 'Pekka' -34°C 0 %   'Haaga' -36°C 0 %   'P.M.A. Tigerstedt' -36°C 0 %   'St. Michel' -37°C 0 %   'Catawbiense Grandiflorum' -30°C 1 %   'Catawbiense Grandiflorum' -30°C 1 %   'Pekka' -34°C 1 %   'Django' -26°C 2 % New planting 'Hachmann's Charmant' -26°C 2 %   'Ken Janeck' -26°C 2 %   'Isola Bella' -27°C 2 %   'Falling Snow' -28°C 2 %   'Jens Jörgen Sörensen' -28°C 2 % New planting 'Catawbiense Grandiflorum' -30°C 2 %   'Catawbiense Grandiflorum' -30°C 2 %   'Kullervo' -34°C 2 % New planting 'Haaga' -36°C 2 %   'Yaku Angel' -24°C 3 % New planting 'Roseum Elegans' -32°C 3 % New planting 'Helsinki University' -39°C 3 % Weakened by insects in summer. 'Sonatine' -24°C 4 %   'Matterhorn' -26°C 4 %   Some damage on leaves (5 to 10 %) Hybrid or Cultivar Name Hardiness Protection Damage Comments 'Calsap' -26°C 5 %   'Ramapo' -28°C 5 % New planting 'Catawbiense Grandiflorum' -30°C 5 %   'Catawbiense Grandiflorum' -30°C 5 %   'Manitau' -26°C 6 %   'Blumiria' -27°C 6 %   'Gradito' -28°C 6 %   'Cunningham's White' -22°C 10 % Flower buds dead. 'Sneezy' -23°C 10 % New planting yakushimanum 'Koichiro Wada' -24°C 10 %   yakushimanum 'Koichiro Wada' -24°C 10 % New planting dichroanthum 'Böhmen' -25°C 10 % New planting 'Oktavia' -25°C 10 % New planting 'Capistrano' -26°C 10 % New planting 'Edelweiß' -26°C 10 % New planting 'Hellikki' -34°C 10 % New planting Considerable damage on leaves (15 .. 30 %) Hybrid or Cultivar Name Hardiness Protection Damage Comments 'Brigitte' -24°C 15 % New planting, flower buds dead. 'Nova Zembla' -25°C 15 % Old leaves are dying and most flower buds. 'Catawbiense Grandiflorum' -30°C 15 % Young plant on dry place. 'Pohjolan Daughter' -34°C 15 % Flower buds mostly dead. 'Roseum Elegans' -32°C 20 % New planting on dry place. 'Pohjola's Daughter' -34°C 20 % Flower buds mostly dead. 'Cunningham's White' -22°C 25 % Flower buds dead. 'Scarlet Wonder' -22°C 30 % Previous winter (-21°C) no damage. A lot of damage on leaves (50 .. 100 %) Hybrid or Cultivar Name Hardiness Protection Damage Comments 'Pearce's American Beauty' -26°C 50 % Previous winter (-21°C) no damage on leaves, but flower buds dead. 'Dagmar' -27°C 65 % Previous winter 95 % damage on leaves. 'Robert Seleger' -21°C 70 % Previous winter the plant was better protected 'Caramba' -24°C 70 % Previous winter (-21°C) only 10 % damage on leaves. 'Kalinka' -25°C 70 % This seems to happen every winter, but flower buds are still OK! 'Gartendirektor Glocker' -20°C 100 % New planting. The plant died. 'Wilgen's Ruby' -23°C 100 % New planting. Previous winter the plant was in cold frame. New growth started from the roots in July. keiskei 'Yaku Fairy' -23°C 100 % New planting. Previous spring had suffered from frost. The plant died. 'April Gem' -26°C 100 % Previous winter (-21°C) no damage on leaves. The plant died.