Answer: Usually this is a symptom of water stress, either under or overwatering, or possibly transplant stress. Dogwoods need an acid soil that is rich in humus; it is possible that the soil is simply unsuitable for the plant, especially when the roots extend beyond the original hole. The soil should also be evenly moist yet well drained so it is never soggy or sopping wet. They are shallow rooted, too, so they may need watering more often than some other plants do. Finally, they appreciate a layer of several inches of organic mulch such as shredded bark over their root zone (not touching the trunk) to help keep the soil cool and moist. You may find that the original potting soil dries out faster than the surrounding soil, so you need to check with your finger to see if you need to water. You may also see that the soil has settled significantly since you planted the tree. This can cause it to suffer from a lack of air in the root zone. If this has happened, you might consider lifting it and replanting it a bit higher. Before you do something that drastic, you might also wish to consult with your county extension to see what they think is the problem because there are some foliar diseases and pests that do attack dogwoods as well. I'm sorry I can't be more specific.
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