You can use a lawn weed killer such as Weed-B-Gone or Spectricide.
I'd wait until the new grass has been mowed at least 3 times, but I
think it's better to forget about the weeds until next year. If you
can identify each of the weeds, all the better. My yard was very
weedy the first couple years, but the overseeding and spot treatment
helped a lot and now I seldom use weed killer. Consider overseeding
your lawn this fall--around mid September when rain is in the
forecast. Also, set your mower to 3-1/2" or higher for fescue. It is
a common mistake that people mow too low which promotes crab grass and
weed growth.

You can probably use another application of starter fertilizer, but at
half rate and when the ground is damp. You can safely apply an
organic fertilizer at any time--I use Milorganite in June (e.TN).

On Sun, 01 May 2005 14:10:46 GMT, Barry Andrews
wrote:

Hi Phisherman,

Location is central NC. The current condition of my lawn is weedy. I
think spot weed treatment would be a waste of time in my case, because
there are a lot of weeds. How long should I wait before applying a weed
killer. Maybe there is some "gentle" weed killer?

thanks,

B

Phisherman wrote:
On Sat, 30 Apr 2005 13:09:33 GMT, Barry Andrews
wrote:


Hi,

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


Not knowing your location nor the current condition of your lawn makes
a recommendation difficult. Weed killers are very punishing to young
grass--spot weed treatment is better. Most slow-release fertilizers
will last a couple months.