- 1). Take the temperature of the soil -- not the air. You cannot effectively apply a pre-emergent herbicide that will control sandburs until the soil temperature is 52 degrees Fahrenheit.
- 2). Remove and discard any excess leaves, lawn clippings or other debris from the lawn.
- 3). Fill a fertilizer spreader with pre-emergent granular herbicide. The herbicide brand name that you chose is up to you, as long as it contains the chemical oryzalin, benefin or pendimethalin. Only use the amount recommended on the herbicide label and follow the label instructions carefully.
- 4). Spread half of the herbicide in one direction and spread the remaining half at right angles to the first application of the herbicide.
- 5). Water the lawn immediately and make sure the ground is completely soaked. This is the only way to ensure the herbicide will work effectively to deter the weeds from growing.
- 6). Reapply the herbicide every six weeks until September.
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