A mix of tall dry fibers and a green undergrowth. 5mm tall fibers.
Also perfect to recreate the vegetation usually found in sand dunes.

One plastic sheet of 14.5cm x 6.5cm full of Gamer's Grass tufts. Tufts are 5mm tall.
Just pop-out the tufts from the sheet of plastic and glue them to your models.

Wild sheet tufts are tufts in a wide variety of shapes. Around 70 tufts per sheet.