Weed Control 

Broadleaf weeds creep into pastures in many forms throughout the year. Not only are they unsightly, but they can limit the grazing available to your horses. Some weeds, such as milkweed and clammy ground cherry, are toxic when eaten. The type of broadleaf weeds in the field varies with the season. Common summer weeds include ragweed, thistle, and horsenettle.

Good pasture management practices help prevent weed infestations. Effectively repairing winter hoof damage and allowing for adequate rest aids the desirable grasses in staying competitive with the weeds. Consistent mowing is the best non-chemical method of broadleaf weed control. Keep the pastures mowed to 8 inches, which will thicken the grass as well as limit the spread of weed seed.

Despite conscientious pasture management, occasionally more action is necessary. When the broadleaf weed population comprises 20% or more of a field, consider a broadleaf herbicide application. There are many types of pasture approved selective herbicides available. When selecting herbicide, read the label carefully and choose the product best suited for your needs. It is important to note that the use of broadleaf herbicides will result in the loss of clover in the field.

The timing of an herbicide application depends on which weeds are being targeted. In order to be most effective, weeds should be sprayed while they are young and growing, eradicating them before they have a chance to seed out. For example, ragweed stands out in pastures in August, but they have actually been growing since late May. To effectively control ragweed, apply herbicide in early June. Likewise, the yellow buttercup flower is obvious in late spring, but should be sprayed in March. It is important to not only watch the calendar, but also consider the weather, growing conditions, and expected field work for that particular year.

Eliminating weeds and clover will result in areas of bare ground which will require reseeding. Reseeding with desirable species in spring or autumn of the application year will promote a thicker stand of grass. It will also prevent new broadleaf weeds or weedy grasses from filling in the space. Keep in mind that many herbicides have reseeding restrictions, and it is important to read and follow all label instructions.

Although horse pastures will never be completely weed free, some fields will benefit from an herbicide application. Broadleaf weeds occupy space that could otherwise be supplying quality forage. A thick sod of desirable grasses promotes more uniform grazing, provides cushion, and helps prevent mud.

Seasonal Tip: Rest a field when the grass is grazed to 4 inches.