Very interesting website...I'd like to know what the downfall to it is. ie. what environmental impact?

http://nomowgrass.com/index.htm?gclid=CITH7JWX55ACFQNCgwod1iw7Ww

NoMowGrass - Eco Friendly, Safe for children & pets.

Easy to maintain, easy to plant.
Once established, NoMowGrass uses less water and energy than high maintenance grasses. . . and ZERO pollution.

Easy to plant over existing lawn or on bare soil.
Naturally short NoMowGrass deters rodent and snakes usually found to hide in taller grasses. Typical blade height is only 3 - 6 inches high.

Yes - it is real grass!