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Originally Posted by gar1976
Broadleaf killers will kill weeds but not grass (eg, Crossbow).
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Correct. And you also need to determine if you have crabgrass as well, which requires something different.
When I purchased this house several years ago the yard was full of crab grass and weeds. It took one and a half summers to get rid of it all. I did a complete overspray with the hose container each year for two years and walked the whole yard 1-2 times a week with the tank spayer with a weed and crabgrass mixture.
This year, my fifth summer, I used no complete spray over the whole yard, no weed & feed (just regular fertilizer for than application) and spot sprayed once in just a few minutes. I'm basically weed free these days. But it took a lot of work the first two summers and the Ortho products are awesome!!