1. apply thinned white glue to the base,
2. place the base in a box larget than the base,
3. liberally sprinlke the static grass on,
4. hold the base upside down over the box and tap the bottom.
5. blow across the grass and that's it.
I then return the excess which is in the box to the baggie. If needed, I'll spot apply more with tweezers and repeat steps 4 and 5.
You can further seal it with aerosol hair spray when the glue has dried.