Paul Hatton replies
Creating grass terrains is a matter of scattering objects and there are a range of ways to achieve this in Blender. They generally fall into these two categories: first of all, utilising particles in Blender, or alternatively by utilising add-ons.
The first is probably the most longwinded of all the options, but it's helpful to take a look at it so we understand the general process of scattering objects across