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John Fulton

John Fulton
Former County Extension Director

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In The Backyard

Horticulture columns and tips done on a timely basis

Fall Weed Control

Posted by John Fulton -

Fall is a great time to apply herbicides to control the tougher perennial weeds and the winter annuals that are just starting to germinate. The tough perennials would include weeds like ground ivy and violets. The winter annuals are mainly chickweed and henbit in our area.

The straight 2,4-D that is used on dandelions seems to act like a fertilizer for chickweed and other problem weeds. Combinations that contain 2,4-D, MCPP, and dicamba are rated very effective on chickweed, henbit, red sorrel, purslane, white clover, and others. These combinations are sold under several different trade names. You can find these at most hardware, discount, and lawn and garden stores. Just check the label under active ingredients and check for two long chemical names and dicamba. You can also check to see that it says it will control chickweed and henbit. This group of chemicals is effective in the 50 degree range and up. As with any chemical control, read and follow label instructions very carefully. There will be some cautions on these product labels concerning injury to sensitive plants that you should be aware of. This is because dicamba can drift as a vapor for a few weeks after you apply it if the weather gets hot and sunny.

The mixture with dicamba will control most broadleaf weeds, and the addition of trichlopyr to this mix will even help with violets.

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