On May 17, 11:51 am, wrote:
Does a chemical exist that one could spray on grass to
slow down its growth.... yet not kill it?

What you're looking for is called a growth regulator. And yes, they
exist and are used to slow the growth of a variety of plants,
including turfgrass.



And can a consumer buy it?

I think you'll find that this stuff is sold in package quantities
suitable to golf courses and similar. Meaning it's going to come in a
minimum size big enough to do acres, with a price tag to match and
distributed through channels that serve those industries.