Yep. For my part, i'm happy with my white sand pumice (or equivalent from Prince August). Rather white than black, for you can turn your white into black easily, while the reverse is not possible. And white basing is far lighter. I prefer, for my part.
About grass, beware not to add to much of them. I consider in 10 mm range sanding is ok for making grass. If you had classical flocage, in will add some extremly high grass. Frequently, there are not so many of them in nature. And they are regrouped as sod rahter than large areas.