- Effective in controlling annual grass weeds, pre-emergent herbicide prevents weed seeds from germinating. Unfortunately, it also prevents seeds of desirable plants from germinating. Wait at least two and up to four months after using pre-emergent herbicide to plant seeds of desirable plants.
- Formulated to kill all vegetation already growing, post-emergent herbicide causes sprayed plants to begin to wilt within a day or two. By the end of two weeks, the affected plants are completely dead. As soon as the dead plant materials are removed from the area, it is OK to plant seeds of desirable plants.
- Corn gluten powder has been tested and found to satisfactorily stop weed seeds from germinating. Essentially, apply it several times during spring, when most weed seeds are actively germinating. Apply corn gluten powder for two to three years for the best results in eradicating the annual weeds. Do not plant seeds of desirable plants until at least 60 days after the last application of corn gluten, the same length of time to wait after using chemical pre-emergent herbicides.
- Set your lawn mower to a height of 2 1/2 to 3 inches during the summer months, especially if your lawn consists of bluegrass, fescues, ryegrass or buffalograss. Many weed seeds need light to germinate and the higher grass will shade the soil, decreasing the numbers of weed seeds that germinate. Mow frequently so not more than one-third the height of the grass is cut in a single mowing. Give your lawn enough water, to encourage the grass plants to grow strong, thereby crowding out the weeds and preventing many seeds from germinating.
Pre-emergent Herbicides
Post-Emergent Herbicide
Alternative, Non-Herbicidal
Cultivation Practices
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