I live in zone 7 and want to know if my Russian Sage plant survive as I just transplanted it this December.
See subject above
You are asking because you know it is an iffy situation. December is fine for planting spring bulbs but awfully late to allow a transplant the time it needs to get roots established. Even in winter, the roots must take up water or dry out and die. Two suggestions: cut it down to 6-12 inches now and water the ground when it gets dry, even in winter.