I live about 20 miles north of Boston, Zone 5 and have a large ROS in my yard that has done well for many years. This year I've got NOTHING, no buds, no leaves, no signs of life. I just cut two large branches off of it (from the ground up) - it was getting way too large and I'm thinking maybe that will scare it into doing something :-)
There are no signs of disease or bugs or anything, and the large sections I cut appeared to be alive - it's hard to tell though, when it's dormant it's so stiff.
It usually leafs out late, but this is ridiculous.
Anybody have a ROS go quiet for a year then come back?? Or is this thing gonzo?