Ask a Question
Notify Me On Question Update
Email this Question
I want to put pre emergent down on my garden to control weeds and the tomato seeds from last year. The snow has melted. Is now the time and what should I use?
Rate This FAQ
One of the problems we have with using pre-emergence herbicides in the garden is that they may affect some of the vegetables we grow. In addition, don’t expect to control all weeds in a garden of mixed vegetables with one herbicide. Why? First, no single herbicide controls all weeds. Secondly, some vegetables are also sensitive to the herbicide, and if the wrong herbicide is used, the vegetable is injured along with the weeds. Finally, some herbicides have quite long residual activity and may have a long-term negative effect on subsequent garden plants.
Generally it is recommended that a gardener use a combination of hand weeding, cultivation, mulching and good garden hygiene to keep weeds under control. Most of us know what hand weeding involves. Cultivation can include tilling, hoeing, and mowing. Several types of mulches used in the garden include plastics, weed barriers, grass or straw mulches, or newspaper or cardboard. Garden hygiene means that we don't allow annual weed to produce seeds that build up the weed problem.
If you do decide to use a herbicide, here are a couple of suggestions. Remember, they need to be applied at the appropriate dosage, at the correct time relative to the weeds you are trying to control, they may need incorporation into the soil, and may only control some of the weeds in a garden
Dacthal (several brand names available) can be used on a wide variety of vegetable plants. Applied correctly, Dacthal gives good control of most grass weeds and a few broadleaf weeds. Dacthal controls weeds as the seeds germinate, so remove existing weed plants prior to application.
Trifluralin (several brand names available) is a pre-emergence herbicide used to control grass problems in the garden. Treflan should only be applied to vegetable tolerant to this herbicide. For the best weed control, mix Treflan with garden soil. After application, mix the herbicide in the top 2 inches of the soil. Read the package label for a list of approved vegetables.
Poast is a post-emergence herbicide that selectively controls grass weeds in several vegetables. Apply Poast to the grasses before they reach 8 inches tall. Mix a crop oil concentrate in the spray solution before application. Read the Poast label for specific instructions and approved vegetable crops.
Glyphosate (several brand names available) is a nonselective, post-emergence herbicide approved for limited use in the vegetable garden sites. Glyphosate is used to eliminating existing weeds before a vegetable seedling emerges from the soil and before vegetable plants are transplanted in the garden. Read the label for specific application instructions and limitations.
For more detailed information on weed control for the yard and garden, refer to the Utah State University extension fact sheet "LANDSCAPE AND GARDEN WEED CONTROL" http://extension.usu.edu/files/publications/publication/HG508.pdf
Submit Your Suggestion
Other Questions In This Topic
- I wanted to mail order some flowers to plant. Is the end of October too late to plant flowers?
- When should apple trees be sprayed and how should we go about it. Is there someone in Utah Co. who will come and do it. We have a golden apple tree that produces big, good apples when taken care of.
- How can I safely dispose of excess pesticides, including herbicides?
- Last year I had a problem in the fall with my tomatoes cracking. I have heard that it is because of uneven watering conditions. I have also been told to plant tomatoes that are less apt to crack. Can you recommend a variety that is less likely to crack? Thanks.
- When and with what should I spray my peach and apple trees for pests?
- I have 4 lovely crenshaw melons on my home garden vines -- 1 large, 2 medium, and 1 small. None of them have gone yellow/white yet! We survived the snow flakes last weekend (I covered everything), but I see we are about to get another "hit" this weekend! Is there ANYthing I can do to speed up their ripening?? I have cut back my watering of the vines, but sprinklers still go on automatically in the morning. Would any of the "usual" things people do to ripen melons indoors (paper bags, put them with a banana, etc.) do any good while they are still on the vine?? From everything I have read, if they are picked while they are still green, they will never ripen -- is this true? If I keep them well covered during our few nights of 32-33 due this weekend, will they survive on the vine to ripen?
- I have a lot of earwigs and spiders in my garden and flower beds. How can I kill them off without making my bed unsafe to plant vegetables in the future?
- Putting more color in your landscape