Answer: You have worked hard to make sure your shrubs get a good start, but it sounds like you are overwatering them. It's true that soil around newly planted shrubs should not be allowed to dry out, but too much water can be detrimental to the shrub's ability to develop roots it needs to stabilize and start new growth. Containers are tricky, too -- if they don't have ample drainage, the plants may feel like they're sitting in a bowl of porridge. The high temperatures may well be exacerbating the symptoms.
Base your watering practice on how the soil feels. One good test of soil moisture is to stick a pencil or popsicle stick into the soil to a depth of a few inches. Pull the stick out at an angle. If soil adheres to the stick, it is moist and you can skip watering that day. The mulch you have applied will go a long way toward maintaining even soil moisture.
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