Hi, 

The mountain laurel symptoms look pretty common for those plants especially when the weather starts to heat up. There could be a little Botryosphaeria canker happening on the stems but it is difficult to see clearly and at this stage. The branches do darker with age too. There could also be some fungal leaf spot on the leaves which is also very common and not a huge concern. If any of the leaves of branches start dying, clip those off and feel free to send in additional clear photos of the dead branches. Mountain laurel really struggle in our heat and humidity in home landscapes. They tend to need the acidic well draining mountain soils and more into western Maryland. 

The Redbud looks like it could have been exposed to a type of herbicide. The leaves are exhibiting symptoms that are typical of exposure with the vascular streaking in the leaves and curling and twisting edges. Do you know if you applied anything near by that could have drifted onto it? Did you apply anything to the lawn that the tree could have taken up through the root system? If not could it have drifted from a neighbors property? 

There isn't anything you can do about the herbicide damage but to water as the tree needs it and wait it out to see if there are additional symptoms or any dieback. It could grow out of it and be fine if it was a small amount. 

As for any pruning it depends on the plant for the best pruning time but in general when it is in the heat of the summer it is not the best time to prune other than broken or dead branches, because it is too hot and could add heat stress to the plant.

• rhododendron, best to prune right when they are done blooming but could still be fine on a cloudy day that isn't too warm. don't prune too late into the fall as it will remove next springs blooms

• boxwoods, any time is usually fine but don't prune past September as it will stimulate new growth which will not have tome to harden off before freezing temps and will get frost damage. 

• camelias, it will depend on when they bloom. There are different species and varieties that bloom from October through April at various times. Generally prune them right after they are done blooming and that way you will not remove the next flowering blooms. 

• witch hazel, shouldn't need much pruning beyond slight shaping and removing broken branches. otherwise they should also be pruned right  after they are finished blooming. 

• azaleas, best in the spring after they are done blooming.

Please let us know if you have any further questions.

Emily