| I would consider how tall you want the trees, or shrubs to get. Also consider how much work you would want to do pruning the row of trees, shrubs. How much light or sun is another consideration. Type of soil. Consider what you want the screen of trees to do. Do you want them to block out your house from the street ? Perhaps you would like to create a mini bird forest. Some ideas for you to consider. Or maybe you have already planted it all out. | 
