where do you live? I have a landscape company in the Arlington metroplex area.
Weeds are a combination of many factors.
Do you maintain your yard on a regular basis? Mowing consistently is a major assistant to weed control, you want to mow and bag the debris so seeds do not fall back onto the ground.
Another thing is the pre emergent treatment at lease twice a year on strategic dates! Along with this is fertilization to make the grass healthier.
Proper watering times are extremely important. And remember your grass needs 1" of water a week. put a glass out and watch to see just how long it takes to give your grass 1". Easy to do!
You can treat your yard very affectively by purchasing weed spray at a local hardware store. It is easy they have some that just fits on your hose!!! You probably have broad leaf weeks and grassy weeds. Get someone to help you select the product for your yard. You will also need to know the type of grass you have.........very important! You probably have to do two treatments, wear gloves and spray in front of you as you walk backwards so you dont step into the grass you just sprayed. It would not be horrible if they sold it in the stores so you are just taking precautions.
---###-###-####
Let me know if you live fairly close.
D. HIll, DennisEnterprises