Garden Pests and Diseases: What's wrong with my creeping thyme?, 4 by jwied73

jwied73 wrote:
I've got a couple kinds of creeping thyme (pink chintz, Doone valley) planted between flagstones. I'm experiencing pretty significant necrosis on the thyme. I planted most of the thyme at the end of spring, though I have replaced a few plants that failed to thrive throughout the summer. I live in zone 8a in north-central GA. Soil is mostly clay, though I amended with mushroom compost and perma-til when I planted the thyme. The thyme is planted near the foundation of my house in an area that tends to pool water after a heavy rain. The standing water drains away after an hour or so. I'm concerned I have a phytophthora problem. I really hope that's not the case. Any suggestions about what's going on here?