本文发表在 rolia.net 枫下论坛Most hybrid roses have not been tested for winter hardiness, so often we have to experiment for ourselves or check with local gardeners. Boerner Botanical Gardens (Milwaukee) did test 350 varieties and 26 were found to be “above average hardiness”: Deesse, El Capitan, Golden Jubilee, Golden Slippers, Golden Wings, Heirloom, Iceberg, Ice White, Irish Gold, Lemon Spice, Lily Pons, Lucky Lady, Manuel Pinto de’ Azeredo, Marie Antoinette, Medallion, Mount Shasta, Nearly Wild, Poulsen’s Bedder, San Antonio, Show Girl, Simon Bolivar, Soeur Therese, Tamango, Tip Toes, Vogue, White Prince.

Dr. Leonard Perry (University of Vermont) has studied cold hardiness in roses. He states, “Generally, polyanthas, floribundas, hybrid perpetuals, shrub roses, and many of the ‘old-fashioned’ roses prove more winter hardy than hybrid teas and grandifloras.” Canadian Explorer roses are Zone 4 hardy. David Austin roses vary from Zone 4 to 6 in hardiness. Meidiland roses are usually reliably hardy only to Zone 5. Rosa rugosa hybrids (the hardiest of all roses) and old garden roses (gallicas, damasks, and centifolias) will do well here. Beware of catalogs that overrate winter hardiness -- they just want to sell more roses. Buy own-root stock if available; if the tops die back, the variety can come back from the roots. A good reference is the University of Minnesota Extension publication, Selecting Hardy Roses for Northern Climates.更多精彩文章及讨论，请光临枫下论坛 rolia.net