Oak tree will also kill trees around it due to its thick foliage blocking the sunlight. This kill zone is 1 tile at Mature, 2 tiles at Old (see below). If you are planting an oak, you need to leave at least 2 tiles between it and other trees. Exclusion zones from Oaks or Willows may overlap the exclusion zone of the Oak, but all trees that are actually growing inside the zone will die.
'''NOTE: ''' The other tree will only be killed when the oak moves to the next age level. Until then it will continue to grow and age as normal.
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