Does a collision material work on instanced particles?

Let's say you simulate a forest with a (hair) particle system, so you model a tree as your dupli object and set its material to collision. Will the particles (trees) scattered around the scene then react to collision? When I tested this, it failed and I could walk right through the instanced trees. Maybe I did it wrong, or is this a limitation of the engine?

Maybe I did it wrong, or is this a limitation of the engine?

This isn't supported for now, although there is no specific limitation here, except overloading the physics engine with the big amount of high-poly particles . I think we'll support it eventually.