We do not recommend laying grass (turf) directly on top of existing grass. This method significantly hinders proper rooting and can lead to a deteriorated lawn over time.
Here's a breakdown of why and what you should do instead:
Why Laying Turf on Existing Grass is a Bad Idea:
- Poor Rooting: The new turf needs direct contact with soil to establish a strong root system. Existing grass acts as a barrier, preventing this crucial connection.
- Weed Problems: Weeds present in the existing grass can easily grow through the new turf.
- Disease and Pests: Existing grass may harbor diseases or pests that can infect the new turf.
- Uneven Surface: The existing grass can create an uneven surface, leading to inconsistent growth and a bumpy lawn.
- Decomposition Issues: As the underlying grass decomposes, it can create unfavorable conditions (like excessive moisture or nutrient imbalances) for the new turf.
What to Do Instead: Preparing for New Turf
Instead of laying turf directly on grass, follow these steps to prepare the ground properly:
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Kill the Existing Grass:
- Herbicide: Apply a non-selective herbicide (like glyphosate) to kill the existing grass. Follow the manufacturer's instructions carefully. Allow sufficient time (usually 1-2 weeks) for the herbicide to take effect.
- Manual Removal: Alternatively, you can physically remove the existing grass and thatch using a sod cutter or by hand. This is more labor-intensive but avoids the use of chemicals.
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Remove the Dead Grass/Thatch: Rake away all dead grass and thatch to expose the soil.
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Till or Dig the Soil: Till the soil to a depth of at least 4-6 inches. This loosens the soil, improves drainage, and allows for better root penetration. If you don't have a tiller, you can dig the soil with a spade.
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Amend the Soil: Incorporate organic matter, such as compost, into the soil to improve its fertility, drainage, and water-holding capacity.
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Level the Soil: Use a rake to level the soil surface. Ensure there are no dips or bumps. A smooth, even surface is crucial for uniform turf growth.
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Roll the Soil: Use a lawn roller to compact the soil slightly. This helps create a firm base for the new turf.
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Water the Soil: Lightly water the prepared soil before laying the turf. This helps settle the soil and provides moisture for the new turf's roots.
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Lay the Turf: Lay the turf in a staggered brick-like pattern, ensuring that the edges are tightly butted together.
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Roll the Turf: Use the lawn roller again to ensure good contact between the turf and the soil.
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Water Thoroughly: Water the new turf immediately and thoroughly. Keep the soil consistently moist (but not waterlogged) for the first 2-3 weeks to encourage root growth.
By properly preparing the ground, you create an environment that promotes healthy turf growth and a beautiful, long-lasting lawn. Neglecting the preparation can lead to costly problems down the road.
