This chapter focuses on ways to improve existing stands of trees. Removing undesirable species and poor quality trees, increasing tree growth rates, improving wood quality, and protecting trees from pests are common goals. You can continually improve your woodland with small steps in short time blocks. Practices are organized by tree size classes: seedling (less than 1-inch stem diameter), sapling (1- to 4-inch stem DBH), poletimber (5- to 9-inch DBH), and sawtimber (10-inch DBH and larger).