This guy was planted per instructions/best practices about 3 months ago. It's about 1 foot in diameter, it's in a decent partial-shade/partial-sun location, and I have supplemented with liquid plant food twice (every ~4 weeks) during this time. I am in North Texas where it is pretty hot and humid at this point.
It was healthy for a while, but over the last 4-6 weeks it began struggling and now looks like this: (broken link - file has been deleted).
There were some heavier rains for a while and ground may have been too wet/over-watered for several days (maybe a week?), but that's all I can think of that would have upset it. Are the blackened leaves indicative of fungus or pests?