Trim broken branches and limbs back to the point where they join with the trunk or a larger branch. Use sharp pruning shears and avoid making rough or jagged cuts, as this may promote disease.
Scar growth that looks dead using a sharp knife. If there is any sign of green beneath the outer layer of bark, the foliage still has life. Cut limbs and branches with no signs of life back to the nearest healthy growth.
Trim completely dead branches back to soil level.
Inspect the bush after temperatures warm in spring and leafing out begins. Prune back dead growth that was missed during the late winter trimming.
Apply 10-6-4 fertilizer, at the rate directed on the package, in early spring. Spread the granules beneath the bush, beginning three inches from its base and reaching outward to the tips of the farthest reaching branches.