Do balloon flowers need to be dead headed?
What is wrong with my verbena?
You can deadhead old or dead growth. That will be fine. Those are pollinated flowers, and will turn into seed pods if left on. This article will help you with the care of these: https://www.gardeningknowhow.com/ornamental/flowers/balloon-flower/growing-balloon-flowers.htm
The verbena appears to need fertilization. This article will help you to care for them: https://www.gardeningknowhow.com/ornamental/flowers/verbena/growing-verbena-plants.htm