Thuja plicata 'Aldrich Mountain' is a beautiful and robust Western Red Cedar with cascading branches. This plant is suitable for use as a solitary or as a hedging plant. 'Aldrich Mountain' displays a fresh green color, and its playful branch arrangement sets it apart from other Thuja varieties. Even in winter, the plant retains its vibrant green hue and does not take on the bronze-brown tint seen in other Thuja varieties. Bremmer Boomkwekerijen from Waddinxveen submitted the plant for evaluation and is also introducing it to the market.