Step-by-Step Grass Replacement Ground Cover Installation

The Shift to Low-Input Landscaping

Traditional turfgrass lawns demand excessive water, synthetic fertilizers, and weekly mowing. As municipal water restrictions tighten and homeowners seek sustainable alternatives, installing a grass replacement ground cover has become a premier landscaping strategy. Unlike high-maintenance Kentucky Bluegrass or Bermudagrass, alternative ground covers like microclover, creeping thyme, and sedum require a fraction of the inputs while providing superior erosion control and pollinator support. According to the EPA WaterSense program, replacing just 50% of your turf with drought-tolerant ground covers can reduce outdoor water use by up to 40%.

This guide details the exact, step-by-step procedures for eradicating existing turf, preparing the soil matrix, and establishing a thriving ground cover. We bypass generic advice to provide specific seeding rates, plug spacing metrics, and real-world cost data.

Phase 1: Ground Cover Selection Matrix

Before breaking ground, you must match the plant to your site's microclimate and traffic requirements. The University of Minnesota Extension notes that site-specific selection is the primary determinant of long-term survival. Use the decision matrix below to select your species.

Phase 2: Turf Eradication and Soil Preparation

The most common failure point in ground cover installation is inadequate removal of the existing turf. If Bermuda or Zoysia grass rhizomes remain in the soil, they will outcompete your new ground cover within the first year.

Step 1: Non-Chemical Turf Removal (Solarization)

For warm-season grasses, solarization is the most effective eradication method without using glyphosate.

1. Mow and Water: Scalp the existing lawn to a 1-inch height. Water the area deeply to a 6-inch soil depth. Moist soil conducts heat more efficiently, accelerating the cooking of weed seeds and rhizomes.
2. Apply Polyethylene: Lay down 6-mil clear polyethylene sheeting (do not use black plastic; clear plastic traps a wider spectrum of solar radiation, raising soil temperatures to 140°F+ at the surface).
3. Seal the Edges: Bury the perimeter of the plastic 6 inches deep in a trench, or weigh it down with heavy landscape timbers to prevent wind lift.
4. Wait: Leave the plastic in place for 4 to 6 weeks during peak summer heat (July/August in the Northern Hemisphere).

Step 2: Soil Amendment and Grading

Once the turf is dead and removed, test your soil pH. Most ground covers thrive in a pH range of 6.0 to 7.0.

• For Microclover: Do not add nitrogen-rich amendments. Clover is a legume that fixes its own atmospheric nitrogen via Rhizobium bacteria. Adding synthetic nitrogen will only trigger a massive flush of broadleaf weeds.
• For Thyme and Sedum: Incorporate 2 inches of coarse compost and 1 inch of expanded shale or perlite to ensure rapid drainage. These species will suffer root rot in heavy, compacted clay.
• Tilling: Rototill the top 6 inches of soil to break up compaction, then use a heavy landscape rake to level the grade, ensuring a 1% slope away from your home's foundation.

Phase 3: Seeding and Plug Planting Procedures

Planting methodology varies drastically depending on whether you are using seed or vegetative plugs. Follow these precise specifications to ensure uniform coverage.

Procedure A: Seeding Microclover

Microclover seed is incredibly fine (approximately 750,000 seeds per pound). Broadcasting it by hand will result in severe clumping.

1. Carrier Mixing: Mix 1 lb of microclover seed with 10 lbs of dry, fine playground sand. This acts as a carrier to ensure even distribution.
2. Application Rate: Apply at a rate of 1 to 1.5 lbs of pure seed per 1,000 square feet.
3. Inoculation: Ensure your seed is pre-inoculated with Rhizobium leguminosarum biovar trifolii. If it is not, purchase a specific clover inoculant and coat the damp seeds immediately before sowing.
4. Pressing: Do not bury the seed. Microclover requires light to germinate. Use a lightweight lawn roller (filled only halfway with water) to press the seed firmly into the top 1/8 inch of the soil matrix.

Procedure B: Planting Thyme and Sedum Plugs

Vegetative plugs establish faster and suppress weeds more effectively than seed for non-legume covers.

1. Grid Layout: Use a string line to mark a 6-inch by 6-inch grid for rapid coverage (requires 4 plugs per square foot), or an 8-inch by 8-inch grid for a budget-friendly, slower-fill approach (approx. 2.25 plugs per square foot).
2. Drilling: Use a 2-inch bulb auger attached to a cordless drill to create uniform planting holes. This prevents the soil smearing that occurs with hand trowels.
3. Planting Depth: Set the plug so the crown (where the stems meet the roots) is exactly level with the surrounding soil. Planting too deep will cause crown rot; planting too shallow will expose the roots to desiccation.
4. Backfilling: Backfill with native soil and water immediately to collapse air pockets.

Pro-Tip for Slopes: If installing ground cover on a slope greater than 15%, pin biodegradable jute netting over the soil immediately after planting plugs. This prevents soil washout during heavy rains before the root systems can anchor the grade.

Phase 4: Establishment and First-Year Maintenance

The first 90 days dictate the long-term viability of your grass replacement ground cover. The primary goal during this window is moisture management and weed competition suppression.

Watering Protocol

• Days 1–14 (Germination/Rooting): Water lightly 2 to 3 times daily for 5 minutes per zone. The top 1 inch of soil must remain consistently moist, but not saturated.
• Days 15–45 (Root Development): Reduce frequency to once daily, but increase the duration to deliver 1/4 inch of water per session. This encourages roots to chase moisture deeper into the soil profile.
• Day 46+ (Establishment): Transition to deep, infrequent watering. Apply 1 inch of water once every 7 to 10 days, depending on local evapotranspiration rates.

Weed Competition Management

Ground covers are not immune to weed invasion during the establishment phase. Because broadleaf herbicides will kill clover, thyme, and lippia, chemical weed control is off the table.

• Pre-Emergent Strategy: For plug plantings (thyme/sedum), apply a corn gluten meal pre-emergent at 20 lbs per 1,000 sq ft immediately after planting to inhibit weed seed germination. Do not use corn gluten if seeding microclover, as it will inhibit the clover seed as well.
• Manual Extraction: Hand-pull aggressive competitors like crabgrass, spurge, and bindweed every 10 days. Allowing weeds to canopy over your young ground cover will starve it of sunlight and stunt lateral stolon growth.

Financial Breakdown and ROI

While the upfront material cost for plug-based ground covers is higher than traditional sod, the long-term ROI is substantial. Below is a 5-year cost projection for a 1,000 sq ft yard conversion.

By executing these precise soil preparation, planting, and maintenance steps, you transition your landscape from a high-input liability to a resilient, ecologically beneficial asset. Proper species selection and rigorous adherence to the establishment watering schedule will ensure your ground cover outcompetes weeds and thrives for decades.