Disregard it. You CAN'T fight nature, and using these fertilizers is making
things worse because you also kill beneficial plants and insects.

Crab grass (and dandelions, and other plants) is not the problem: people
with the wrong attitude toward nature and native plants are the problem.
Just look at the person doing so: he (or she?) is into a vicious cycle that
will never end, as seeds migrate all the time (by wind in the case of
dandelion, by sticking to animals or people, by birds, etc) - it is a losing
proposition at best.

"New Question" wrote in message
. ..
We know a person that puts a certain kind of fertilizer on his lawn. The
fertilizer kills what he calls "crab grass" and turns it yellow-brown,
while
the rest of the lawn is still green. So this guy always has a lawn full
of
large, round, yellow-brown spots. He claims he must kill the crab grass
this way, then plant new grass seeds in the yellow-brown spots.

What is the best way to handle this "crab grass" problem?