Tree Architecture refers to the overall shape of a tree, best seen on most trees when the leaves are gone. Tree shape is dictated by both the inherent DNA of each species (genotype) and the tree’s interactions with and responses to its environment (phenotype.) Learning to observe various tree shapes is a fun way to spend time outdoors; learning the science behind it furthers more looking and outdoor exploration. The Arboretum is a great place to explore the diversity of tree architecture.

First, build your own background knowledge about the science of tree architecture by reading this article. Then, select from among the following activities to add to student discoveries.

Use these simple illustrated shape cards to lead students on a tree architecture hunt.

Download this presentation with extensive teacher notes to guide your class in tree observation—through art and movement—and develop poetic language skills.

Take a trip around the world to view the many ways humans have shaped tree architecture.

Then, download this science experiment to see tropism in action.

Use this presentation with images from the Arnold Arboretum to explain the differences between genotype and phenotype. Students can use this worksheet to record their sketches and hypotheses.