Did you know that the Indian Government initiated soemthing called the Vanmahotsava (Festival of Trees!) in the '50s to encourage the planting of trees? Well it did. And this is observed the first week of July. Since i am here this year, i will keep my eyes open for what is said and more importantly, done on this day.
The United States for its part has the Arbor Day. Different states observe the arbor day on different days of the year, but for the most part it is in the months of April and May.