Title: “Winter resistance and frost resistance of cultivars of groundcover roses introduced to M.M. Gryshko National Botanical Garden of the NAS of Ukraine”
Article in Russian.
http://plantintroduction.org/index.php/pi/article/view/17/12
Thank you Henry. Looks like interesting work. Ukraine has a very wide range of temps. I’m not sure where the national botanical garden in located. Kiev? It does get rather cold there, or at least it used to.The CV names are in English too in a table listing how they did over winter. Also a table indicating survival in a lab test to various low temps for those CVs. I think we could pull out the main results with google translate.