Do not use a weed killer on your new grass. You can control the weeds
with mowing. The grass is too tender for 2 4d.

Reseed the sparse patches. and water well.

Fertilize with CIL Golfgreen which will last til autumn.

Derryl.

I overseeded my lawn about 5 weeks ago, and I applied a starter
fertilizer as well. The new grass has come up and I have already mowed
once. (4") The new grass looks kind of puny in a lot of places, and I
was wondering if it was too late to hit it again with fertilizer. I am
thinking that I did not apply enough the first time. I checked the soil
pH with a meter and it read 6.8, so I think that should be good. In 2-3
more weeks I want to apply a weed killer. Would it be okay to use a
fertilizer/weed killer combo, or is it too late for fertilizer?

many thanks for your help,

B