This tool made with Geometry Nodes Allows you to scatter leaves in the surface of an object.

A it uses instances, you can scatter an insane amount of geometry without using too much memory. It allows you to use different settings in render time and viewport ad to use a mask to limit the amount of geometry, in that way, you can work without having performance issues.

It also comes with a realistic Leave Shader, let you use a custom leave collection to be scattered and have all the setting you need to get the desire result fast.

You just need to append the LeaveScatter.blend, go to the NodeTree and select the LeaveGen Node. After that, add a Geometry Node modifier to the object and select the LeaveGen. You can follow the video.