Hello!
I'm using L systems to attach an animated leaf to the branches but I'm not sure how to randomize the timing of the leaves.
I would usually use copy to points in a for each loop and use the iteration variable to offset the timing of each instance.
Is there a way to do something similar with L systems? Or is there a way to create point groups for the leaves?

Yes .You can do that in L-system and Chops you have files on Odforce .
Just search ...you have endless files on that topic .
Try on Houdini Kitchen to.
Have Fun.