- 1). Dig small stands of dill by hand with a hand spade. Remove all of each plant, including the long taproot, so that the plant cannot return. Burn the plant material to destroy any ripe seeds. Mulch the area with 6 inches of leaves or mulch to smother any remaining seeds.
- 2). Destroy larger areas of dill by mowing the stand close to the ground just before seeds form. Cover the area with dark plastic or a thick layer of wet newspaper. Check regularly to ensure that the plants have been killed. Leave the area covered until the following spring, renewing the newspaper or plastic if necessary.
- 3). Spray a standalone clump of dill with a nonselective postemergence herbicide such as glyphosate. Apply the herbicide to the leaves once the dill plants are actively growing. Cover any ornamental plants that might be accidentally sprayed with herbicides, because they will damage any plant they fall upon.
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