arbor day (day of trees) april 10 (the us,canada,australia...) in many countries it has long been the tradition to hold an annual tree or forest origin of such celebrations dates back to antiquity and is in the dawn of religious feeling and awe for what trees ,arbor day,as it is commonly known today,is of american origin and evolved from conditions peculiar to the great was first observed in nebraska in 1872. the idea,conceived by ,then a member of the nebraska state board of agriculture,was one of forest was a move to promote replanting,following deforestation,and to plant up treeless idea has spread widely to other lands where it is variously celebrated as the ‘festival of tre