How to Kill Green Pasture Weeds

Green weeds are a common problem in pastures due to low cutting frequency and low fertility levels. Green weeds may go unnoticed in pastures because they blend in with the tall pasture grass. If you have weeds growing in your pasture, you will want to kill them as soon as possible. Weeds steal valuable nutrients, water and sunlight from pasture grass. Some weeds can even make animals sick.

Selective herbicide

Instructions

- 1
  Identify the weeds. Not all weeds are created equal; what kills some pasture weeds will not kill others.
- 2
  Choose a selective herbicide to kill the identified weeds. Make sure the selective herbicide is designed to kill your particular weed. This information can be found on the back of the herbicide package. For example, while 2,4-D is an effective herbicide for musk thistle (a common pasture weed in Tennessee), it is useless against sedge.
- 3
  Apply appropriate amounts of herbicide. This information can be found on the package, but, in general, appropriate application will be 10 to 20 gallons per acre, according to the University of Tennessee.
- 4
  Reapply the herbicide, keeping in mind that weeds are active at different times. One spraying per year will not be effective. If possible, spray the appropriate selective herbicide when the weed is young. Mature weeds are more difficult to kill.
- 5
  Fertilize your pasture. Fertilizer helps desirable plants and grasses flourish, leaving less room for weeds to grow. Fertilize during peak growth times for your particular pasture grass; fertilizing in dormant times may actually encourage weed growth, reports the website Get Rid of Things.

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