Faye, Since you are going to redo the bed you had the plants in, this would be the best time to come up with a strategy to modify their environment a bit to make the area safer for semps. I'm suggesting perhaps some plants that provide shade during hot sun times, perhaps a tall wall that would do the same, etc.
I have some potted small fruits, such a Nanking Cherry, blueberries, etc that I can move to different locations during the growing season. I find that some of them can be useful for shading sensitive plants. Of course, potted cherries and blueberries have to be watered more in the pot than if they are in the ground, so there is some extra effort involved.
This would also be a good time to increase soil drainage. You could also make sure the bed has a slope to it so that there is runoff, build tiers, use rock layouts, etc.
Think about what would work best for you. I think hotter than usual summers will be with us for a while to come.
