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There are organic ways to have a nice lawn but it
will always have some weeds. Secret is to fertilize at the
right time so you don't feed the weeds. Best time to fertilize is fall and
late March, if you want it greener feed 1/2 rate in early July as crabgrass
will flourish if you fertilize in June.
Dig out crabgrass before it goes to seed as it is an annual and
can only grow from it's seed the following year. As Rav mentioned
keep the grass cut high so the weeds need to compete for light.
Use a propane torch on weeds in the driveway or walk.
Deep water so the grass can compete against the shallow rooted weeds.
If you absolutely need to, just spot kill the weeds with a herbicide.
Keep a sharp blade to prevent tearing the grass and prevent disease.
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