I did some landscaping a couple of weekends ago and planted some trees and shrubs. Over the past few days I noticed some of the leaves are turning black and shriveling. For example, here is a pic of my "Autumn Blaze" Maple: Albeit this tree is from Wal-Mart... but I also have some Dogwood and some Aspen from a reputable local nursery that are showing similar symptoms. I watered them thoroughly when I planted them. The weather has been cool since with some heavy rain. So, I thought they might be over-watered. But, isn't that hard to do with something planted in the ground? Also, I used some leftover fertilizer spikes when I put them in... so I thought perhaps that could be the problem. But, I've used spikes at my last house on a large Linden with no issues. Any ideas?