Plant leaves with overlapping alpha channels
When it comes to plant models, it’s necessary that leaves would be modeled exactly around the alpha channel.
If you have too many rectangular leaves overlapping each other, Cycles and other renders will have to produce lots of ray intersections, which would lead to an unrealistic rendering of the plant.
Have a look at this lecture to learn more: : The Holy Grail of Plant Creation - Julius Harling
Thanks for watering your plants!