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The cool thing about this possibility is that you can control the particle's features like cast/receive shadows, the amount of grass generated, if the grass is affected by light probs and reflection probs or not, etc. If these instructions are followed, this will generate grass with GPU instancing. Ideally, you would have to have a script that calls the Stop() function so the particle system stops calculating generation, but still keeps the instantiated particles in the scene.

You can make the grass particle infinite by disabling the Over Lifetime module in the particle, activating Looping and Prewarm and typing Infinity in the StartLifetime option. The slightly more complex but way faster option is to use a particle (shuriken) system with a Mesh emitter with 0 Gravity and Force and with Normal Offset set so that the grass appears on the mesh's surface. The con of that option is that it's time consuming. (It's one or the other, but by enabling both, the engine will which manage what's where based on the priorities.) This will allow the grass to be either batched or having a single copy stored in the GPU and rendered with the lighting variation. The trick is to make sure it's both a static prefab as well as having GPU Instancing enabled on its material. Then place copies of those manually one by one in your scene. The simplest way is to create your own planar mesh and apply a shader with back faces or use a reversed V pattern which are really close to each other and where each side is the mirror of the opposite. There are a couple of ways you can handle grass outside of Unity's Terrain System. This is an old topic, but it's still valid.