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How to get rid of foxtails 
Use glyphosate or similar products. 
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.