Parable of the Budding Fig Tree
This eschatological parable follows the Olivet discourse in Luke 21:5-28 (and Matthew 24 and Mark 13).  New buds appear on the branches of trees when Winter ends.  The buds open into blossoms and green leaves in Spring.  Fruit starts to appear as Summer arrives.  When  the signs of the end of the age start to happen, it means Jesus will return soon.