Spray your verbena and clover plants with a broadleaf post-emergent selective herbicide that contains MCPP. Apply the spray evenly over the foliage of the plants. Wait six to eight weeks for clovers to completely disappear.
Till former verbena and clover areas three to four weeks after applying the spray to reseed. Distribute a starter fertilizer with a NPK amount of 5-10-5 at a rate of 20 lbs. per 1,000 square feet to promote grass seed growth.
Broadcast your preferred grass seed in bare or thinning areas. Cover the grass seed with 1/8 inch of compost and water. Keep areas watered to promote grass seed germination.
Apply a broad-spectrum herbicide that contains glyphosate on clovers and verbenas where grass or other vegetation isn't growing, such as driveways, walkways and patios. Lay a piece a plastic over any nearby vegetation, because glyphosate will kill any plant matter it comes in contact with.
Dig up verbena or clover plants growing right next to your ornamental flowering plants. Ornamental flowering plants may suffer harm if sprayed with a post-emergent broadleaf spray. Burn or throw away weed debris.