Tree Planting Fail

Tree Planting Fail

I live in the Piedmont of NC. I got three Yaupon Holly trees from an online mail order source in the first part of October. After they arrived I couldn't get them in the ground for about 4 days. I thought I did the right things planting them, dug a hole significantly bigger than the modest root ball (these guys are only about a foot tall) and used new bagged topsoil to fill it up. Watered every three days unless it rained (which it has been, quite a bit, but they are on the top of a slope so I expect drainage isn't much of an issue) for the first 2 weeks they were in the ground. Now their leaves have turned a nice red brown and have fallen off and I expect they are dead. Any suggestions as to what went wrong?
Garden Porn

Garden Porn

Question about my roses and pics!

Question about my roses and pics!

Feeding time at the watering hole

Feeding time at the watering hole

Mushrooms

Mushrooms

flower identification please

flower identification please

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