Solving problems Can Hydretain kill grass? Legacy post 2016-05-11 No Comments lrodptl – posted 18 June 2008 23:52Last week I applied Hydretain per the directions to my backyard Kentucky Bluegrass 9 year old established lawn. This week more than half the grass is dead in the application area. Coincidence?Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) ← Pythium Blight? Weed & Feed for Bermuda lawns →Leave a Reply Cancel replyYou must be logged in to post a comment.