Does Weed and Feed Kill Clover? Identification & Control Guide

The Short Answer: Does Weed and Feed Kill Clover?

Yes, standard granular weed and feed products will kill clover, but only if they contain specific post-emergent broadleaf herbicides. Fertilizers paired solely with pre-emergent herbicides (like prodiamine) will prevent new clover seeds from germinating but will do absolutely nothing to existing clover plants. To eradicate established clover, the product must contain active ingredients such as 2,4-D, Dicamba, or MCPP-p. When applied correctly during the plant's active growth phase, these systemic herbicides are absorbed through the clover's leaves and translocated to the roots, causing fatal cellular overgrowth.

Identifying the Invader: White vs. Red Clover

Before applying chemical controls, confirm the exact species of clover invading your turf. Misidentification can lead to selecting the wrong herbicide concentration.

• White Clover (Trifolium repens): The most common lawn invader. It features three smooth leaflets (trifoliate) with distinctive white, V-shaped chevron markings. It grows low to the ground and spreads via creeping stolons, making it highly resilient to close mowing.
• Red Clover (Trifolium pratense): Features larger, hairier leaves and a more upright growth habit. It is less common in maintained lawns but frequently appears in neglected or low-fertility turf.
• Microclover (Trifolium repens var. Pipolina): A dwarf cultivar sometimes intentionally mixed into eco-lawns. It has significantly smaller leaves and requires specialized herbicide dosing to avoid damaging surrounding turf.

The Science: How Selective Herbicides Target Clover

Clover is a dicot (broadleaf plant), while your lawn grass is a monocot. Selective weed and feed formulations exploit this biological difference. The synthetic auxins (2,4-D and Dicamba) mimic the natural plant hormone indole-3-acetic acid (IAA). When clover absorbs these synthetic hormones, it triggers unregulated, rapid cell division. The plant essentially grows itself to death, twisting its stems and curling its leaves (epinasty) before vascular collapse occurs. Monocot grasses possess a different auxin receptor structure and rapidly metabolize these chemicals, leaving them unharmed.

Active Ingredient Efficacy Matrix

Not all weed and feed bags are created equal. Check the active ingredient list on the back of the bag. Here is how the most common herbicides perform specifically against clover based on university turfgrass extension data.

Source: Data synthesized from University of Minnesota Extension turfgrass management protocols.

Step-by-Step Application Protocol

To achieve a 90%+ kill rate on mature clover patches, follow this exact application sequence. A standard 14-pound bag of Scotts Turf Builder Weed & Feed (covering 5,000 sq ft) typically costs between $25 and $32 in current markets.

1. Prep the Canopy: Mow your lawn 2 days prior to application. Set your deck to 2.5 inches for cool-season grasses or 1.5 inches for warm-season grasses. This removes excess grass blade surface area, ensuring the granules reach the clover leaves.
2. Time the Moisture: Apply the granules in the early morning when the clover leaves are wet with dew, or lightly mist the lawn with a hose right before spreading. The moisture acts as a glue, causing the herbicide-coated granules to stick directly to the broadleaf surface rather than bouncing off to the soil.
3. Calibrate the Spreader: Use a rotary spreader. For Scotts standard rotary spreaders, set the dial to 5.5. Walk at a steady pace of 3 feet per second. Overlapping passes will result in nitrogen burn from the fertilizer component.
4. The 48-Hour Rule: Do not water, irrigate, or allow rainfall on the lawn for at least 48 hours. The herbicide requires extended foliar contact time to penetrate the clover's waxy cuticle. Watering too soon washes the chemical into the soil, rendering it useless against established broadleaves.

Troubleshooting: Why Your Clover Survived

If you applied weed and feed and the clover is still thriving three weeks later, one of three edge cases has occurred:

1. The Cuticle Barrier (Mature Clover)

Older, mature white clover develops a thick, waxy cuticle on its leaves to retain moisture. Granular herbicides often fail to penetrate this barrier. The Fix: Switch to a liquid ester-based herbicide (like SpeedZone) mixed with a non-ionic surfactant. The ester formulation penetrates waxy cuticles 3x faster than amine formulations.

2. Soil pH Lockout

Clover thrives in acidic, low-nitrogen soils (pH below 6.0). If your soil pH is imbalanced, the turfgrass roots cannot uptake the nitrogen from the 'feed' portion of the product, leaving the grass weak and unable to outcompete the clover. The Fix: Run a $15-$20 soil test. If pH is below 6.0, apply pelletized lime at 50 lbs per 1,000 sq ft in the fall.

3. Wrong Grass Type Restriction

Many standard weed and feed products contain 2,4-D, which can severely stunt or kill St. Augustinegrass and Centipedegrass. If you have these warm-season grasses, you must use a product specifically formulated with Atrazine or Penoxsulam instead.

Organic and Spot-Treatment Alternatives

For homeowners maintaining organic lawns or those dealing with isolated clover patches near vegetable gardens, synthetic auxins are not an option. According to the EPA's guidelines on safe pest control, targeted spot treatments minimize environmental runoff.

Iron HEDTA (FeHEDTA): This is the premier organic broadleaf killer. Products like Natria Lawn Weed Control or Fiesta Turf Weed Killer utilize chelated iron. Clover absorbs the iron rapidly, causing oxidative stress and cellular rupture within 3 to 6 hours, turning the leaves black. Grass, however, naturally regulates iron uptake and recovers within a few days. Expect to pay $45 to $60 for a one-gallon concentrate. Apply via a pump sprayer directly to the clover foliage on a dry day with temperatures between 60°F and 75°F.

Frequently Asked Questions

Will pulling clover by hand work better than weed and feed?

Hand-pulling is only effective for very small, isolated patches. White clover spreads via underground stolons. If you pull the plant and leave even a half-inch of the stolon in the soil, it will regenerate a new crown within 14 days. Chemical translocation to the root system is required for large infestations.

Can I overseed my lawn immediately after applying weed and feed?

No. The broadleaf herbicides in weed and feed remain active in the soil for 21 to 30 days. If you drop grass seed too soon, the herbicide will inhibit the germination and root development of your new turfgrass. Always wait a minimum of 4 weeks after application before overseeding.

Does clover actually harm my lawn?

Aesthetically, it disrupts uniform turf color and texture. Agronomically, clover is a legume that fixes atmospheric nitrogen into the soil. While this provides free nitrogen to surrounding grass, clover's aggressive creeping growth habit will eventually choke out thin turf, leaving bare patches when the clover naturally dies back during summer droughts.