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Is 0.00000420 centimeters per second as fast as Grass growing?

It's about one-and-one-tenth times as fast as Grass growing
The speed of Grass growing is about 0.00000400 centimeters per second.
(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 0.00000420 centimeters per second 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.
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