Rhino EZ Straw Grass Seed Germination Blanket 4' X 50'. EZ Straw grass seed germination blankets are just like commercial straw blankets in a homeowner size. The 200 square foot blanket is perfect for slopes, banks, and ditches by holding grass seed in place and insuring that it does not was away. Simply unroll and stake with included stakes, seed, water, and watch your grass grow. After grass is established, blanket simply biodegrades. 9 rolls in a display carton.