Researchers in northern Japan studied the growth of three valuable tree species over nearly 50 years. By analyzing long-term forest data, they created models to predict how monarch birch, castor aralia, and Japanese oak trees grow. These models consider tree size, competition, and forest management. The predictions matched actual tree growth well, with correlations ranging from 0.62 to 0.73. This information will help manage these high-value timber species more effectively in the future.