I need to install 26 Graham Blandy boxwoods for a customer that I did a big install for this fall. I couldn't locate this variety until now. BUT now that we have a couple of inches of snow on the ground (should be gone in a couple days) am I going to have to replace many of these come late spring? I just want to finish this job really bad so I can clean up and mulch. I am in Richmond, VA zone 7a. 7a is rated down to 0-5 degrees but I honestly can't remember anytime in the past 10 years that it has been below 10 degrees. Any advice would be appreciated.