Sacrifices to the Sun God

The heat has claimed many victims in our garden, despite protective watering:  potted carnations, lobelia, lantana, and fuschia are dead.  The double impatiens, hydrangea, salvia, pincuschion plant, and petunias are hanging on, barely.  There's been a break in temperature, thankfully; now, we could use some rain.  Usually my garden doesn't succumb until August.