I moved into my house, from out of state, with a yard full of weeds (dandelions, morning glories, etc.) When would be a good time to treat them? Before or after winter hits? Any suggestions of products to use? Thanks!



If we have a few days with high temperatures between 70 and 80 degrees, you could go ahead and treat the weeds this fall. A basic weedkiller herbicide with 2,4-D in it will kill dandelions very effectively. Field bindweed (aka morning glory) is much more difficult to kill, and responds better to a glyphosate-containing (broad spectrum) herbicide. But you can only use that in areas where you want to kill ALL the plants - because it is non-selective.                              

Always spray on a calm day, preferably in the morning. Select an herbicide that is labeled for your purpose, and mix it according to the recommended rates for that purpose.
The USU Extension publication "Landscape and Garden Weed Control" is a useful tool to help you learn which herbicide to use. You can download that publication at http://extension.usu.edu/files

Posted on 23 Oct 2007

Maggie Wolf
Horticulture Agent, Salt Lake County

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