You could create one patch of grass and then use distribute to make copies to fill a large area. In Vue Pro each patch of grass can either be a copy or a new patch of grass. If you need to fit it onto a terrain which isn't flat (which I did for a picture I did a while ago) make all of the grass above the terrain and then drop it onto the terrain. Finally delete any bits of grass that arn't where you want them to be and fill in any gaps with new. One warning though - this method will up your render times considerably especially (I'd guess) with wind turned on.

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