What does your landscaper say? Many suppliers warranty plants for something like a year - especially when professionally planted. With that many plants suffering, would get their advice/support... oh, and not be too quick to blame the dog for most of it.

Agree with PKponder that a lot could be due to stress of June planting. Though seems most of those could be kept alive even in pots watered every other day in shade. Any chance they're getting much more light now that the Sun is passing further to the south than in June? I fried our second year seed started goldenball leadtrees not accounting for this change while we were out of town for a couple weeks last August.

My dog pees on all my plants but it doesn't kill them :-)

Sunday October 4th Denton County Gardeners is having a plant swap, in Carrollton at Mc Innish Park, If interested contact me and I will happily give you more details. I do have extra coneflowers currently growing in pots and also have seeds for next year.

But coneflower isn't going to do well with shade. Get a soil test to see what you're dealing with soilwise and ammend as needed, keep doggy out of area, replant in the fall (end of September is usually good) and learn from what does well and what doesn't. When I first moved to Texas from Seattle 30 years ago I planted 3 of everything I bought (in different areas). Those that did well I planted more of. Those that chose to die went on my 'don't plant here' list.

Azaleas sometimes don't spread their roots after transplant. This could be caused by the planting area wasn't prepared well, or the roots weren't teased apart when they were transplanted from a container (from the nursery).

The symptom is that they seem to be doing well and then suddenly the leaves begin drying and falling off, and even with more water, the plant doesn't seem to respond positively. I wonder if this may have happened to your azalea and other plants?