About a month or two ago, I replaced some shrubs at a home that was built about a year ago. Everything went well except for the yaupon holly. It is by itself, seperated from the other beds by the driveway. The original yaupon died and they called me to replace it along with a few other shrubs. I replace it and in less than five days, half of the leaves had turned black. I replaced it with another yaupon and it did fine for 2 or 3 weeks and now it's leaves are beginning to turn black. I am wondering if there is a problem with the soil. I am going to have a soil test done at my expense. I am thinking this because all the other plants are doing fine, and this one is seperated from them. If anyone has any ideas on what it could be, please let me know. Also if it is a soil problem, should I have the customer pay for the new plant and I supply the labor or should I just eat the cost. I just don't want to buy a third plant for the same spot. By the way I'm in NE Oklahoma.