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For example, some weeds grow in situations of compacted soil, such as knotweed. You can also control growth by taking better care of grass, rather than focus on weeds. You can raise or lower mowing height, change frequency of mowing and changing amount of time between irrigating. Also, you can increase or decrease application of fertilizer and aerify soil. This will maintain better grass, thus keeping growth dense and vigorous, which as discussed above, does not attract weeds.
In addition to culture practices, sometimes assistance of chemicals is needed to control weed growth. In that case, there are several types of herbicides that can be used. Preemergence herbicides will affect seeds that are germinating. Since they are best used two to three weeks before seeds start to grow, these work best to combat annual weeds. Postmergence herbicides are used, as their prefix implies, after weeds have sprouted. Since they must be absorbed through leaves, this types of herbicide works best with a spray.
These can be used at any time, but are most effective when weed is still young and growing. Selective postmergence herbicides are usually used to control annual, biennial and perennial broadleaf weeds, as they will not damage grass. But, they can kill trees, shrubs and flowers. These have to be used in proper conditions as well, with no rain in forecast for two days to follow, air 60-80 degrees and no winds. Finally, non-selective postmergence herbicides kill all types of weeds, and are best used to spot treat grassy weeds that are not affected by selective herbicides.
So next time you see a Dandelion plant growing, don't make a wish and blow seeds toward in direction of a lawn fanatic- they may not get perfectly manicured lawn they wished for!
For hundreds of other tips for creating your own perfect lawn, be sure to visit: http://www.YourPerfectLawn.com