First my sympathy at the damage the freezing weather caused in Texas.  I agree that cutting back cold damaged plants is a good way to jump start their new growth but I recommend you fertilize with a slow release plant food like Osmocote around the plants as you do not want to encourage too much fast sprouting new foliage. When a plant is given too much nitrogen the resulting leaf growth can be soft and more susceptible to more cold damage, insect feeding and disease.  Winter is not over yet. Osmocote is formulated to be released slowly when the soil temperature warms up so your plants will be encouraged to grow when it is safe to do so. If there is a bright side to the damage after the storm, it is that Mother Nature may have cleared out some weak plants and some plant pests and made room for younger plants and more desirable plants.  Perhaps you'll enjoy the design process and nursery visits to replace plants that you have lost and also enjoy the fresh new growth on the heavily pruned plants that survived. Keep growing, Marianne Binetti