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Broadleaf fertilizers will not work against foxtail since foxtail is a grass. If you want to use chemical control methods, you should look for an herbicide that can kill grasses. One of the most easily accessible types is a chemical called glyphosate. Glyphosate is a non-selective herbicide, so it will kill just about everything in the area you apply it in. For best results, spray the entire area with the glyphosate. Even though the other vegetation there will likely die, this is the quickest and most effective way of getting rid of fox tail. You will probably need to apply the herbicide two to three times, at minimum, before it wipes out the foxtail completely. Wait until after the foxtail reemerges before using another application. You should wait until two weeks or so pass before re-applying the herbicide, especially if using a potent one like glyphosate. While chemical herbicides can take care of the majority of the problem, enlisting the help of certain organic control methods can help in between applications, making the extermination process go quicker overall. Seven to ten days after you apply the herbicide, turn under the dead plant residue. If you plan to amend the soil, do so now.
Use glyphosate or similar products. Apply several times. Combine chemical herbicides with organic weed-control methods.