Hi Sandy. I'd never even heard of a blind rose, before.If it is just as vigorous as the others, or even more so, I really just can't begin to wrap my mind around that one ! Though I suppose they must know more about it, than I do.
Yes, their customer service is excellent. Since their stock, is "sold out" until next spring, I can well understand, why they'd have to make you wait, until next February ! Just be patient & in the meanwhile, maybe you can try pruning, somewhat, just several weeks prior to when your weather starts to change, maybe mid to late August & see if that doesn't give you any blooms, for autumn, on new growth !
If some can flower, into fall, here, I'm sure they can do the same for you, there & then maybe you'll know, if in fact, what they say, is true, about your rose being blind...Possibly if a newer one, the buds stock & all has been "pushed" a bit, in an attempt to have adequate supply, to meet demands... But , they've "sold out" until next spring... & who knows, maybe if you prune yours back & use a fertilizer with a higher middle number, you'll tend to promote blooms by autumn & then will know, if in fact, it truly is as they say, a "blind rose"..
I'm not sure of I will buy, older popular varieties next, or newer one's next year !