If you are pruning cedar trees and you cut branches back into the dead zone, they will not regrow.

How do cedar trees multiply?

Cedar does not produce flowers. Instead, it reproduces via cones. Cedar is monoecious plant which means that it produces male and female cones on the same tree. ... 12 months after pollination, female cones are ready to release winged seed.

Do cedar trees grow back after trimming?

If you prune the tops, more sun can reach the cedars' lower branches, encouraging growth. Don't be too liberal in taking the tops off the cedars, though – remove under ¼ of the height, since the tree will grow slowly from the top. It may take a few years for the cedars to regain their old majestic shape.