In the long term, tilling will always be the better way to go versus
aerating, slit seeding, or thatching. There is no comparison.

There is no reason to till the roots of crabgrass, especially after you have
applied Roundup.
--
Baine

"John F" wrote in message
om...
Recently I had to use Roundup in a very big area of my yard in order
to get rid of crabgrass (I needed to do it early enough before the
cold weather so I can seed the area now). I have read somewhere that
after killing the crabgrass is important to till the soil to get rid
of the roots. But some people have mentioned that if I aerate several
times that will be enough to prepare the soil for seeding tall fescue.
This is my first lawn and obviously my experience is limited. I will
appreciate any thoughts you may have. Thanks!