Particle system problem. Plz help.


When I press ctrl+j to join the leaf and the tree, the materials just disappears for the leaf. It’s annoying as hell and I couldnt find a fix. I’m getting a feeling that this is a bug and not my mistake. I’ve converted the particles -> deleted the particles in the tab-> and pressed ctrl_j to join them. After I did Ctrl+J, the leaf got screwd up and became transparent/invisible. How can i join a particle system with the mesh it is on?
Thank you