Answer: Hay was not the best product to put on your new lawn because it is full of seeds. Straw would have been a better choice - it is seed free. But, now that you've got a yard full of hay you may have to hand pull it out. Anything that you use to kill the hay will also kill the grass in your lawn. I know that's not what you want to hear, but it's the best way to deal with the problem. Hay should be easy to pull, roots and all, if you go after it while it is small and tender. The only alternative is to remove the existing lawn, hay and all, and start over again. Best wishes with your lawn!
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