In United States Arbor Day (from the Latin arbor, meaning tree) is a holiday in which individuals and groups are encouraged to plant and care for trees. Celebrations are held as early as January and February in some southern states and as late as May in more northern locations. National Arbor Day is observed on the last Friday in April. On This Day we decided to gather books on wildlife across America, and the fascinating world of plants, written for young readers, but imagination capturing for many adults )