It’s almost time to start planting you summer time flowers and you need to make sure there is a good plan in place.  One of the biggest issues you can experience with your flowers is proper drainage and making sure the roots don’t rot.  This is ever more true when you get all of the rain we have recently experienced. In a case like this one, the edge of the bed is boarded with bricks that prevent the water from draining fast enough.  As it builds up it causes the roots to stay wet and the plant ends up dying. The answer would be to pull the dead plants for now and next time don’t plant the flowers as close to the edge. You could also consider pulling some drainage in the edges as well.  The most important thing though is to always take a step back with looking at your issues and think outside the box. Sometimes the answer is easy and obvious. Hope this helps!