- 1). Apply a pre-emergent weed control to your lawn in the fall. A pre-emergent contains herbicide that is designed to reduce and eliminate weeds, including oxalis. Check the packaging instructions to determine how much weed control to apply to your lawn. Applying an all-in-one weed and feed combination of fertilizer and herbicide in the fall or early spring is a great opportunity to get a jump on weeds before they emerge.
- 2). Maintain a healthy lawn by repairing bare or thin spots. Thick, healthy growths of grass tend to choke out weeds. If healthy grass is growing, there is little room for oxalis. Repair thin or bare areas by applying a thin layer of top soil and seeding with a quality grass seed. Cover the area with pine straw and add a starter fertilizer such as an 8-8-8. (An 8-8-8 is a balanced fertilizer that contains 8 percent each of nitrogen, phosphoric acid and water-soluble potash, according to Garden Gazebo.) Water thoroughly until the seedling grass is established.
- 3). Spray established oxalis with an herbicide spot treatment. There are several brands of herbicide weed killer available. Look for herbicides that contain the herbicide glyphosate. Spray oxalis with a direct stream and confine the spray to the weed because glyphosate also will kill grass.
- 4). Put on a pair of gloves and pull oxalis from your lawn by hand. Make sure to pull the entire root of the weed. If you do not, the weed may easily grow back. Choose a time following rain or a watering when the soil is softer, making it easier to pull weeds.
- 5). Apply mulch to landscaped areas to control oxalis growth. Hardwood and pine mulch are excellent weed controls, as are pine needles. If weeds such as oxalis are persistent in these areas, consider placing a weed cloth underneath the mulch for weed control.
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