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Step 1
Pull weeds immediately. If a weed blooms, it can spread its seed throughout a lawn, prompting growth of dozens of weeds. Removing weeds by hand is generally as effective as applying an herbicide, and is certainly safer for humans, pets and the environment. To prevent regrowth, you must remove all weed roots.
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Step 2
Grow grass that's naturally weed resistant. Hybrid Bermuda is weed-resistant because blades grow very close together, forming a dense turf that leaves little room for weeds. Don't confuse hybrid Bermuda with Bermuda crass, which can turn into a weed over time.
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Step 3
Mow lawn regularly. Mowing once per week is a good rule of thumb, but grass may need more cutting during warm, rainy months and less during winter. Cut grass to the species-appropriate length, generally between 2 and 3 inches. Cutting grass too short actually encourages weed growth. Longer grass blades block sunlight, discouraging weed growth.
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Step 4
Fertilize at least twice per year. Many lawns only need fertilization in the early fall and spring, but fertilization schedules vary among species and their environments. Keep in mind that over-fertilization or fertilization just before or during a dormant period can encourage weed growth.
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Step 5
Water thoroughly. Most types of grass need at least one inch of water every week. The amount of water a specific lawn needs to thrive, depends on environmental factors like climate, exposure to sun versus shade and amount of rainfall. Watering too much or at the wrong time can create unhealthy conditions that increase chances of weed invasion. Running sprinklers at night, for example, can prompt fungus growth, so it's best to water just before the sun comes up.
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Step 6
Apply herbicide when necessary. Most herbicides kill existing weeds, so only use them when you have a weed problem. Follow directions closely, applying formula only to problem areas, avoiding bordering plants and flowerbeds. Use a pre-emergent herbicide to prevent new weed growth.
