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?
My terrace starting to *move*…

My terrace starting to *move*…

tomato bottoms turning black!  and bumps on the stem

tomato bottoms turning black! and bumps on the stem

So I’m kinda

So I’m kinda

My 3 African Violets

My 3 African Violets

Really proud of this one

Really proud of this one

Plant id

Plant id