Spiegel Grove has an estimated 1,700 trees, some of which date back to President Hayes’ time and even earlier.
President Hayes loved Spiegel Grove and took care in planting trees and a variety of plants. He chronicled his work in a diary he called “Our Home.”
Hayes also enjoyed naming trees in honor of people who he felt made great contributions to society. He would have a tree ceremony where the honoree would put his hands on the tree, and the trees would be marked with plaques.
The Hayes descendants continued that tradition. Some trees on the grounds still have plaques noting the person for whom they are dedicated. Honorees included Presidents James A. Garfield and William Howard Taft, as well as Admiral Chester Nimitz.
Trees of note include: 
- Bicentennial Oak, which stands to the side of the Hayes Home and is marked with a plaque. It dates back to 1776 and takes its name from still standing during the county’s bicentennial in 1976. It is one of the largest trees at Spiegel Grove.
- The George Washington tulip poplar, which actually blooms. This tree is located at the back of the property and came from a seedling sent from Mount Vernon, George Washington’s Virginia estate.
- A seedling from the Oklahoma City Bombing Survivor Tree, which was planted in 2016 in front of the Hayes Home and is thriving.
Other interesting tree varieties that can be found on the grounds include holly, gingko, dawn redwood and flowering magnolia and dogwood trees.