A new and distinct cultivar of Thuja tree named ‘RLH-CS’, characterized by its relatively compact, upright and narrowly pyramidal plant form; moderately vigorous growth habit and moderate to low growth rate; freely branching habit; dense and bushy form from base to top of the tree; lateral branches that are fine-textured and flexible and resist cracking and splitting; dark green-colored leaves that are soft and fine-textured and tolerate high humidity and high temperatures conditions; and good garden performance.
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