mkopec
<Gold Donor>
Actually the way it was explained to me by a pro, is the opposite. If your grass is healthy you will not have weeds because the grass will stifle them. Weeds only grow on unhealthy lawns. A good weed and feed does the job. What you do is apply the weed and feed when the grass is wet, either after a rainfall or when the dew sets in at night so it sticks to the foliage of the weeds. Usually the weeds will start to curl up and die within a week.our house was a foreclosure before we bought it, it had sat empty for a year or two before we got in there, and the yard was a total wreck.
If your yard is really bad, like 50% weeds/crabgrass or more, I'd highly recommend just dealing with weeds the first year. If you try to grow grass in the middle of all those weeds, and trying to kill those weeds, you're going to waste a lot of money on grass seed and fertilizer and watering. The conditions will be too harsh for most types of grass to really grow well if you're spraying for weeds really often. And if you have that many weeds, you need to be spraying like once or twice a month probably, which won't leave you any decent window for growing grass. And if you go easy on the weeds so that you can get grass growing, you aren't going to stop the weeds, they'll just be back next year, and the year after, and the year after. Basically nuke those things this year while you don't have to worry about harming your nice grass, and start over from scratch next year growing some nice grass, or installing sod.
Focus on getting the weeds eradicated the first year, then you can really get some nice grass going the next year with minimal weed control needed.