Add back the soil and compact it firmly to remove any air pockets.
Jun 17, Mature cedar trees can be trimmed on the top once they are at the height you want, but keep the top rounded.
You will prune them when you plant them or if you have an established tree you will want to prune them during the late winter months up until just before they start to bud.
Also know that cedar trees are unable to. Dec 27, Prune overgrown cedar trees carefully; the can cedar trees be trimmed in winter are green only on the outer portion of the branch. If too much green is cut away, it will not grow back and the tree may die. Prune.