What is Pre-Emerge Fertilizer? I have be told to put down Pre-Emerge Fertilizer on my lawn....

I have be told to put down Pre-Emerge Fertilizer on my lawn. I cannot find it at the stores. Does Scott's trade name it? If so, which bag/what is it called? Where can I find this stuff at?
Clematis cut to ground- will it regrow?
Answers:    There is a brand call Anderson chemical compounds are 22-0-6 with pendulum. a pre-emergent is used to control already established weed while fertilizing your lawn. Some home and garden stores may transport it or a different brand, must likely you will enjoy to shop at any commercial lawn and garden store.
Is sand accurate for grass? I own tons...
This should be put down contained by the early spring time and can be purchased at walmart or pasture and garden shop.