Answer: Overwatering may be contributing to the problem. Although plants in containers can need to be watered frequently, don't just automatically water them on a daily basis. Check the soil first. Stick your finger down into the soil. It's okay if the top half inch dries out between waterings. Verbena likes to be cut back periodically to keep it looking neat and producing flowers all summer long. So cut back the stems and you'll force new (flowering) growth towards the center and the ends of the plant. Geraniums benefit from frequent pinching, too. Pinch off the faded flowers along with some of the stem. Pinch off any leaves with spots. This will remove any fungal or bacterial pathogens as well and encouraging lots of healthy new growth and new flowers.
Best wishes with your plants!
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