Is it too late to apply herbicides to lawn now?

Asked October 30, 2017, 6:57 PM EDT

Is it too late to apply herbicides to our Westminster lawn now? We have a lot of weeds that have appeared and thought we might get a head start on spring if we do it now but maybe too late? If it is still okay to apply, what type of herbicide would be best this time of year? We have not applied any herbicide for quite some time. Not sure of the grass type that we have. Thank you!

Adams County Colorado lawns and turf

1 Response

Hi,
Thank you for your question. The best way to prevent weeds in a lawn is to ensure the lawn is growing healthy and strongly. This you can achieve by fertilizing and watering well. We have an excellent fact sheet on overall lawn care for you to get more information: http://extension.colostate.edu/docs/pubs/garden/07202.pdf.

To most effectively tell you what types herbicide you can use it's important to know what type of weeds you have in your yard. If they are a broadleaf weed (dandelion, clover, bindweed) you can spray with a 2,4-D product which will selectively kill the broadleaf weeds. Plants are going into dormancy so the effectiveness may be reduced. Please see our Plant Talk article on broadleaf weeds in lawns http://planttalk.colostate.edu/topics/lawns/1525-controlling-broadleaf-weeds-lawns/

If you have weedy grasses you would need to use different products and it's likely too late for many of them as they die with the first hard frost. See our fact sheet on weedy grass control: http://extension.colostate.edu/docs/pubs/garden/03101.pdf.

I hope that helps, please let me know if you have further questions. I could answer with more specifics if I knew the type of weeds you're dealing with.
Thanks,