100 QUAKING GRASS (Rattlesnake Grass) Briza Maxima Seeds BLOOM TIME: Mid Summer HARDINESS ZONE: 5 - 10 PLANT HEIGHT: 24 - 36" . . . PLANT SPACING: 12 - 15" LIGHT REQUIREMENTS: Sun . . . SOIL / WATER: Average Quaking Grass makes an excellent dried grass for arrangements. It has large 1 inch seed heads that are white to pale green with hints of red.