Timing Is Everything. Some fertilizers also contain herbicides that kill weeds. After applying GrubEx to your lawn, you do not have to wait to apply a straight fertilizer. However, you must wait at least one week to apply a combination weed-and-feed control product after applying GrubEx, and two weeks is preferred.Click to see full answer. Correspondingly, can I put down GrubEx and fertilizer at the same time? Using GrubEx with Fertilizer According to the Scotts website, only straight fertilizer, with no other ingredients such as pre-emergent herbicides or other pesticides, may be applied at the same time as GrubEx.Beside above, can you put GrubEx down with grass seed? A: There’s nothing in grub-killers or grub-preventers that’ll hinder grass seed. So yes, you can do both at the same time. However, grubs are very difficult to kill in spring. Plus they don’t do nearly as much damage now as in fall. Furthermore, when should you put GrubEx down? In the summer they lay eggs and in the mid-summer, grubs hatch and start feeding themselves through the roots of the turf. Hence, the best time to apply Grubex is between spring and early summer. It is also usually between late May and late July.How soon can I seed after using GrubEx?GrubEx is not activated until it’s watered in, and as soon as the lawn dries, it is safe for your family and pets. If grubs have damaged your lawn so severely you must replace grass, you may seed, sod or sprig immediately before or after applying GrubEx.
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