To determine which USDA Hardiness Zone your American garden, check out The United States National Arboretum's USDA Plant Hardiness Zone Map
.[From 100 English Roses for the American Garden
, by Clair Martin, p. 64:] Most apricot and yellow roses are less cold-hardy and often do not fare well in the coldest zones.
The American Rose Annual 1928, has a really good article about hardy roses entitled The Blizzard Country: A Symposium, on pp. 47-89.
See also Winter protection
To determine which USDA Hardiness Zone your American garden, check out
The United States National Arboretum's USDA Plant Hardiness Zone Map.
[From The Graham Stuart Thomas Rose Book, p. 13: tenderness] in our modern roses can almost always be traced to Tea and sometimes China parentage...
From Difference in Resistance To Spring Freezes In Rose Varieties, Dr. H.R. Rosen, American Rosa Annual (1956) pp. 118-122: Is there any correlation between the degree of winter hardiness. [of a variety]..when...dormant..and its degree of hardiness once dormancy is broken? The answer appears to be yes, but..
-Varieties with a tendency to break dormancy early suffer more from spring freezes
-Varieties with the most rapid spring growth suffer more from spring freezes
-Varieites planted planted in fall suffer more from spring freezes, probably because of the amount of new growth in spring
-Varieties grown in very fertile soil or with much fertilizer suffer more from spring freezes, probably because of the amount of new spring growth
Conclusion: where such spring freezes are common, withhold quck-acting nitrogen fertilizer until all danger of freeze is over, although organic fertilizers like manure, cottonseed meal, soybean meal or fish meal an be used because they stimulate less growth and thus cause less damage.