Weed n Feed is killing parts of my grass! Why?

I have an established yet patchy fescue lawn in my front yard. This spring I put Naturalime on it and seeded with a Tall Fescue variety all over to fill in the holes. It was growing well and at about 2 inches tall. 5 days ago I put Weed n Feed on it to kill a large crop of round leaved yellow flower plants. Not only did it kill those plants (sorta) but it COMPLETELY killed all the new grass and even some of the old. Now my lawn looks worse than when I started!





What gives?? Where do I go from here?

Weed n Feed is killing parts of my grass! Why?
Without knowing what weed %26amp; feed you used, its hard to tell you exactly what went wrong. I can tell you that applying a broadleaf herbicide when the temperatures are above 85 degrees F can damage some established turf. Was this the case? Newly seeded turf is also suseptable to some broadleaf herbicides until established. Certainly fertilizing this early after reseeding didn't help. Was the weed %26amp; feed application at the appropriate rate? Was the turf drought stressed at the time of the application? Both of these conditions can burn established and newly seeded turf. The best information that I can give you is to please read the label of your weed %26amp; feed. This will tell you if this product is labeled for use on tall fescue, if there is a problem with this product on newly seeded lawns and if there is a temperature limit when applying to certain turfs. The label will be your best source of information at this point.





Where do you go next? Water properly %26amp; determine if the lawn is going to recover. If not, then reseed %26amp; start again. Good luck.
Reply:As a rule weedkillers and fertilisers of any description are to be avoided on newly seeded areas and new grass. I am sure that the product would have carried such information on the packet/bottle. Re-seed after a few months.
Reply:Well, now you can spray weed killer on the weeds that remain, then seed with new grass after the weeds are gone. Don't put anything on the seeded area for a few weeks, and water it well every other day. After a few weeks, when the grass is starting to grow, put fertilizer on it (not weed and feed as this may harm young grass).