Is 12 miles per hour as fast as Grass growing?
It's about 150,000,000 times as fast as Grass growing
The speed of Grass growing is about 0.0000000890 miles per hour.
(for Kentucky Bluegrass, Poa pratensis) (a.k.a. Smooth Meadow grass, a.k.a. Common Meadow grass) (Summer months, ideal growing conditions)
Kentucky Bluegrass, one of the most common grasses in North America, grows about 0.0000000950 miles per hour in the summer months under ideal conditions. When left un-mowed, Kentucky Bluegrass grows to heights of 60 to 90 cm (2 to 3 ft) and blossoms with a blue flower.
There's more! See other comparisons to 12 miles per hour...