Three-year screening for cold hardiness of garden roses

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henry kuska
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Three-year screening for cold hardiness of garden roses

Post: # 69982Post henry kuska
Sat Jun 08, 2019 11:07 am

They looked at:
"Name Synonym Rose type1 Breeder / Author1 Coldest USDA Zone2 Temperature range (°C)3 Ploidy level4 Propagation method
'John Cabot' Hybrid Kordesii Felicitas Svejda 2b −42.8 ∼ −40.0 4x Cutting
'J.P. Connell' shrub Felicitas Svejda 2b −42.8 ∼ −40.0 3x Cutting
'Henry Kelsey' Hybrid Kordesii Felicitas Svejda 3a −40 ∼ −37.2 4x Cutting
'Dagmar Hastrup' 'Frau Dagmar Hastrup'; 'Frau Dagmar Hastopp' Hybrid Rugosa Knud Julianus Hastrup 3b −37.2 ∼ −34.4 2x Cutting
'Moje Hammarberg' Hybrid Rugosa Hammarberg 3b −37.2 ∼ −34.4 2x Cutting
'Modern Centennial' Shrub Henry H. Marshall 3b −37.2 ∼ −34.4 4x Cutting
'Prairie Joy' Shrub Lynn M. Cullicut 3b −37.2 ∼ -34.4 4x Budding on R.corymbifera ‘Laxa’
'Hope for Humanity' Shrub Lynn M. Cullicut 3b −37.2 ∼ −34.4 4x Cutting
'Yesterday' Polyantha Harkness 4b −31.7 ∼ −28.9 2x Grafted on R. canina ‘Pfänder’
'The Fairy' Polyantha Bentall 4b −31.7 ∼ −28.9 2x Budding on R. corymbifera ‘Laxa’
'Milly Winterjewel' 'BOZmillwin' Shrub Biljana Bozanic Tanjga 5b −26.1 ∼ −23.3 4x Budding on R. corymbifera ‘Laxa’
'Abraham Darby' 'AUScot' Shrub David Austin 5b −26.1 ∼ −23.3 4x Budding on R. corymbifera ‘Laxa’
'Compassion' Hybrid Tea Harkness 5b −26.1 ∼ −23.3 4x Budding on R. corymbifera ‘Laxa’
R. wichurana Species Crépin 5b −26.1 ∼ −23.3 2x Cutting
'Snow Ballet' Shrub Clayworth 6b −20.6 ∼ −17.8 3x Budding on R. corymbifera ‘Laxa’
'Chandos Beauty' 'HARmisty'; 'Sweet Love' Hybrid Tea Harkness 6b −20.6 ∼ −17.8 4x Budding on R. Laxa
'Red New Dawn' 'Étandard' Hybrid Tea Robichon 6b"


See:

https://www.sciencedirect.com/science/a ... 3818306988

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