How can you change how the scarecrow plants pines on a gazebo?

At the moment the standard and optimal gets 20, but you can actually fit 24 on a gazebo farm



http://ift.tt/1JYrBYq



was wondering how i could either change this or perhaps get this changed



that is for pines, one of the biggest tree's by the way

How can you change how the scarecrow plants pines on a gazebo?