Arbor, which is Latin for “Tree,” is an environmental holiday where citizens and groups are encouraged to plant trees and care for the already existing trees. Arbor Day was founded by J. Sterling Morton on April 10th, 1872 in Nebraska City, Nebraska, United States where over an estimated one million trees were planted on that single day. Come join us in the Gardens with coffee and donuts and discussion of our tree collection. You can help our Garden Staff in planting trees in the Gardens. Learn how to plant trees and what will make a healthy tree grow. Free program with admission.