Utilize Blender Hair Particles with Instancing and add a collision object - BlenderNation
How to make hair only appear on one side of object? I would like to use the particles to disperse trees over the top of this "island" - Not the entire icosphere.
Can particle objects have their own children? - Particles and Physics Simulations - Blender Artists Community
Blender Sushi: VFX / Particle Instance Modifier
Particle Instance Modifier — Blender Manual
Is it possible to recursively instance object particles? - Blender Stack Exchange