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Witch Hazel
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The effect that you describe is called leaf marcescence; it’s the trait of deciduous and refers to retaining plant parts after they (the parts) are dead and dry. It’s not clear why some trees and shrubs do this. Normally, the leaves come “unglued” (not the technical term) and fall off in autumn. Sometimes an early cold spell may interrupt the leaf drop. Reduced sunlight might inhibit it, causing leaves to remain attached. There are other possibilies, but know that when new growth appears in spring, it will release the leaves and you will forget it ever happened.
It's hard to say for sure why they're not doing well, as there are a lot of things that factor in to a plant's success in the garden. Clay soil could certainly be a culprit, however. Witch hazel prefers to grow in rich, moist soil in partial shade, but clay soil may be a step too far in the "compacted" direction.
Another factor could be the pH of the soil. Witch hazel grows best in slightly acidic soils, so if yours leans more towards basic, it could be prohibiting proper growth.
We would recommend doing a soil test through your state's cooperative extension, which will tell you what kind of soil you have already and what's missing. They may also be able to give you more advice for getting your witch hazel back on track!


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