Available from Rosefire.com, who state that this rose is hardy to zone 4 and does very well in their zone 5.

Where does one get hardiness zone 6 for this rose? Since I grow in zone 5 thank goodness that everyone else reports the hardiness of Old Moss as zone 4. Everyone except Mary's Plant Farm... who report zone 3!

A well nigh perfect bloom, which, of course, requires a good photo to show it off. A bloom, a most pleasing violet, that seems right in between the pink and purple shades of William.

Great form. A bloom that shows William's pink (as opposed to his purple) side. A lovely vision.