Why? By hunting and collecting plants you can create something beautiful and informative. Take a nature walk and carefully collect some specimens that you find fascinating. Any heavy book will help flatten the plants, and wax paper can seal them off for display. Plant hunting has been happening for centuries, and is an important activity for any budding botanist.
What else? Pressing plants provides a window into the plant kingdom. Explore the plants in your environment, collect some specimens, and record your findings. More curriculum connectors can be found here.