> Quote - Try removing the bump function for the leaves.

OK!
It seems that removing the Bump of Leaves the flickering disappear.
I made some tests and I am satisfied for smoothing.

But I decided to replace the Cone-ShapedConifer with BulkyConifer, because this specie of plant has more leaves, and the leaves are more tick and dense; this appears more appropriate for plants along the river.

• But after the complete rendering of the last 150 frames (that taken about 15 hours), I seen bad artifacts at the borders of BulkyConifer !
  See the attached image.
  I am unlucky !
  These artifacts appears as bad behavior of alpha channel, but I am not sure what is the cause...
  Help!
  Horsepower0171.