I would like to plant a row of tall evergreens in my back yard for privacy. What would be the tallest evergreen you can suggest and what time of year can they be planted?
As long as the area gets at least 4 hours of sun per day, Green Giant Arborvitae would be the best choice. They can be planted anytime the ground can be dug but spring is the best time so they have a chance to establish a root system before winter. More on them HERE.