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In page Tsuga:

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The species are all adapted to (and are confined to) relatively moist, cool temperate areas with high rainfall, cool summers, and little or no water stress; they are also adapted to cope with heavy to very heavy winter snowfall and tolerate ice storms better than most other trees.[1][2] Hemlock trees are more tolerant of heavy shade than other conifers; they are, however, more susceptible to drought.[3]