Answer: If weed and feed products are not effective, you may need to dig up one or two of the weeds and take them to your cooperative extension office for identification. Some weeds, such as wild onions or wild violets, do not respond to weed and feed products and need to be dug out, roots and all. You didn't describe the weed so I'm afraid I can't really make any suggestions about control other than to dig them out. Wish I had a better solution!
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