Oxana, even the most thornless of roses occasionally produce prickles. I recently took cuttings of my double white Lady Banks rose. Banksiae are considered some of the most "thornless" of roses, yet this one was throwing prickles. My Annie Laurie McDowell hadn't thrown a prickle I ever found in over twenty years, yet last year, I found ONE! Reine des Violettes is generally considered to be thornless, yet it sometimes produces very bristly canes. It honestly isn't in the nature of the rose NOT to have prickles. For those developed from climbing species, they are a climbing mechanism, permitting their canes to hook on to tree branches and other plants for support as they throw themselves through the tree canopy and out into the sun where they can feed themselves, produce their flowers for pollination to perpetuate the species. Perhaps for those which sucker, forming thickets in grasslands and such, they inhibit the grazing habits of animals which would otherwise decimate the plants and lead to their premature extinction? For those with bristly hips, they may even function as other bristly or prickly hips, attaching themselves to animal fur to help distribute their seeds. Birds help distribute the seeds of species such as multiflora which has small "berry like" seeds. So, please don't hold it against a nursery if they can't guaranty their plants of a variety are without prickles. Even if the plant hasn't demonstrated them in decades. one day they WILL!

Banksiae prickles