Tsuga mertensiana in the eastern landscape?

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Over the last decade I have transplanted six beautiful, heallthy Tsuga mertensiana from containers into a “good” hillside hemlock growing area in the NC mountains – in which all previous Tsuga introductions (T canadensis, caroliniana, seiboldii and diversifolia) have survived and apparently prospered. But all the T mertensiana have failed during a period of 6 to 15 months after transplant, with complete needle loss within a 2 week period. I hope that someone who has had success with T mertensiana in the eastern landscape has a “secret” to share?