Is the soil useable after a weed killer is applied?

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Chemical weed killers are designed to destroy a plant's root system and should be applied before you begin planting. Soil is inhospitable to all plant life immediately following the application of chemical weed control, but it will not stay this way. Weed control chemicals usually evaporate within a few days.

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1. Time Frame

   • After an application of chemical weed killer, the soil will be unsuitable for plant life for 24 to 78 hours, depending on the type of weed killer used. After this period, the majority of active chemicals will have evaporated and the soil will once again be usable.

   Fruits And Vegetables

   • Very few plants are able to grow when weed killer chemicals are present in the soil. If your plants are growing, it means that the soil no longer contains these chemicals, so the risk of dangerous chemicals being absorbed by fruit-bearing plants and contaminating their fruit is negligible.

   Risks Associated With Weed Killers

   • While chemical weed killers will not prevent plant growth permanently, their harmful effects on helpful microorganisms in the soil may be felt throughout the growing season. Moreover, the ingredients in chemical herbicides have been known to cause a variety of health problems in humans, ranging from acute poisoning symptoms to long-term health problems, according to the 2009 Pesticide Action Network Database. Use caution when applying these chemicals.

   Alternative Options: Mulch

   • Mulching is a natural way to control weed growth without causing damage to other plant life. A layer of mulch will deprive small weeds of sunlight. Mulch can also attract helpful organisms to your garden.

   Organic Weed Killers

   • Salt, sugar and vinegar solutions are also effective at controlling weeds. Sugar, like chemical weed killers, makes the soil temporarily unsuitable for plant life, while salting can prevent plant growth for an entire season. Vinegar can be applied directly to the offending weeds throughout the growing season, though care should be exercised to avoid spraying the plants you've grown.

Source: www.ehow.com

Tags: weed killer, chemical weed, plant life, after weed, after weed killer, application chemical, application chemical weed