Particles fall through collision object I am trying to make leaves fall on the ground but the leaves are intersecting the ground.

This is the collision floor seen from under:



The object has collision enabled and Particle Damping to the max. I've played around with different settings but couldn't find one that worked.
I haven't been able to find a similar question here where the particles are falling onto the object...
To avoid particles to intersect with the ground, check Size Deflect checkbox in particle system Physics settings. This is not a perfect solution either, cause the particles will hover over the ground plane a little, so what you can do is to use this plane as collision box, which won't be rendered and it's duplicate without collision added, which you move closer/furhter away to the particles and which will be rendered. If you need even more physically accurate interactions between leaves and a plane, you would need to use separate objects (which can be created from particles by Shift+CTRL+A) and make them rigid bodies.