Shadows in terrains

I'm trying to add shadows at the moment in one of my projects. I've got a simple cube, and a tree-shape, and I added a point light qutie close. The tree does not cast any shadow at all. I've tried 'baking' a lightmap, but that doesn't have any effect either. Does anyone know how to make shadows which actually work?

Lights don't have shadows unless you turn on hard or soft shadows in the light. Real-time shadows don't work unless you have Pro (baked shadows are OK without Pro).