Return to the Lawn Care Forum | Post a Follow-Up

Weed Killer 14 Days After Over Seeding

Posted by LawnMan2011 none (My Page) on
Sun, Apr 3, 11 at 22:02

14 days ago I overseeded my lawn with Scotts Tall Frescue Grass Seed and then I applied Scotts Starter Fertilizer.

Today I spot sprayed my lawn with Ortho Weed B Gone Max with Crabgrass Control. I ended up spraying 50 % of my Lawn. After I spot sprayed my lawn it started raining a about an hour later. This weed killer says its rain proof in 1 hour.

Is there still a chance grass will grow in the areas I spot sprayed my lawn with weed killer considering the above mentioned facts?

Follow-Up Postings:

RE: Weed Killer 14 Days After Over Seeding

I believe Weed B Gone is a POST-EMERGENT weed killer. Are my chances increasing?

RE: Weed Killer 14 Days After Over Seeding

It's safe to apply WBG if you've mowed the new grass three times. If you overseeded 14 days ago, it's unlikely that you've mowed three times.

However, since WBG only affects plants by contact with the leaves, some of the new grass may survive if it had not yet sprouted.

Where are you? Depending on your location, even if the grass survives your attempt to kill it, it may not survive the summer.

RE: Weed Killer 14 Days After Over Seeding

I'm in Maryland. It has rained alot since I overseeded. I havent moved my grass even once as it hasn't started growing yet, and the new grass hasn't yet sprouted. Are the odds on my side that my overseeding hasn't been adversely affected by me using WBG?

Additionally, since it rained just an hour after I finished using WBG and its still raining will this lessen the effect of my efforts to rid my lawn of weeds. I'm hoping I can luck out.

Thank you for your help.

RE: Weed Killer 14 Days After Over Seeding

I would be a little concerned that you have no grass germination after 14 days. Tall fescue is a pretty quick germinater, 14 days is at the long end of time for it (unless it says differently on the bag of seed). Have you been watering your lawn 2-3 times a day for 5-10 minutes each time to keep the seeds moist? The Weed-B-Gone max is not going to help your new grass, it can only hurt. I'm pretty sure that it works by foliar absorbtion, so if you have no seedlings, it might be ok especially since it rained. The only thing your can really do anyway is wait and seed what happens, or overseed again. I would give it a week to make that decision.

RE: Weed Killer 14 Days After Over Seeding

After I made my initial response, I started thinking that WBG may have some pre-emergent qualities and also may stick around for a little while. I may be wrong. Do you still have the container? It may have something on it about how long it lasts, how soon you can use it, etc.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Lawn Care Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here