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Do the trees on a base grow? Can a level 1 become a level 6? A level 5 become a 6?
Or should a low level be removed with hopes that a level 6 will replace it?
Thank you for your help!
@yurnxt is correct, @zyton. I suggest cutting the small Trees and placing your buildings on different spots, then wait for higher level ones to appear randomly on free spaces. Enjoy playing!