What to do about Brown grass?
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Ayesha Kamal
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Grass turns brown when roots can no longer grab nutrients or water from soil, or when soil doesn't contain enough food or water. It could be a grub problem which mimics drought damage. Use a shovel to undercut a 1-by-1-foot square of turf, then peel back the patch and look for more than 10 grubs/square foot, which indicates a problem. You can try spreading milky spore powder to treat for that.
You don't say the reason for the brown. It could be dog pee, insects, not enough water or some sort of disease. A picture is worth a thousand words.
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Fix Burnt Grass & Dog Urine Spots With This Easy Solution!