Yellow leaves on 'Little Lamb'
I just bought a little lamb from a local nursery last week. I mixed in peatmoss & planted it the same day.
It has about 6 or 7 blooms But the leaves are turning yellow, brown, then falling off. Soil has not been tested but was moist at planting and a few days after. I should also note that there is about 12" to 14" of top soil over a clay base.
Q's; Could this be a sign of root rot? Or something else?
What can or should I do for this plant?