No, it is not recommended to lay new turf directly on top of existing grass. This practice can lead to several significant issues that compromise the health and longevity of your new lawn.
Why Laying Turf on Existing Grass is Not Recommended
According to expert advice, attempting to lay turf over an established grass layer presents immediate and long-term challenges. Understanding these pitfalls is crucial for a successful lawn project.
- Poor Rooting: The primary concern is that the existing grass acts as a barrier, preventing the roots of the new turf from establishing properly in the underlying soil. Without deep root penetration, the turf will struggle to absorb water and nutrients, leading to a weak and unhealthy lawn.
- Weed Proliferation: The old grass and any dormant weed seeds beneath the new turf can continue to grow. Weeds, in particular, are resilient and may push through the new turf layer, leading to an unsightly and difficult-to-manage lawn.
- Deterioration Over Time: If the underlying issues that prompted the desire for new turf (e.g., poor soil, compaction, or disease in the old lawn) are not addressed, the new turf is likely to deteriorate quickly. Laying turf on grass is a temporary fix that doesn't solve foundational problems.
- Uneven Surface: The unevenness of the underlying grass can create an inconsistent surface for the new turf, leading to bumps, dips, and poor drainage in certain areas.
The Right Way to Lay New Turf: Essential Preparation
For a vibrant, healthy, and long-lasting lawn, proper ground preparation is paramount. This involves removing the old grass and preparing the soil beneath.
Here are the key steps for successful turf laying:
- Remove Existing Grass:
- Manual Removal: For smaller areas, you can use a spade or turf cutter to physically remove the old grass and its roots.
- Chemical Method: A non-selective herbicide can be used to kill the existing grass. Ensure you follow product instructions carefully and allow adequate time for the herbicide to work before proceeding.
- Smothering: For an organic approach, cover the area with cardboard or black plastic for several weeks to kill the grass by blocking sunlight.
- Clear Debris: Remove any stones, roots, and other debris from the area.
- Improve Soil Quality:
- Test Soil: Consider a soil test to understand your soil's pH and nutrient levels.
- Amend Soil: Incorporate organic matter like compost or well-rotted manure to improve drainage, aeration, and nutrient retention.
- Level the Ground: Rake the area thoroughly to create a smooth, even surface. Ensure there's a slight slope away from any buildings for proper drainage.
- Compact Lightly: Gently roll or tamp the soil to create a firm but not overly compacted base.
- Apply Starter Fertiliser: A pre-turf fertiliser can provide essential nutrients to encourage strong root development for your new turf.
Understanding the Risks: Turf Over Grass vs. Proper Preparation
| Feature | Laying Turf on Existing Grass | Proper Turf Preparation Method |
|---|---|---|
| Rooting Success | Poor and shallow, leading to weak turf | Strong and deep, promoting healthy growth |
| Weed Control | High risk of weeds emerging from beneath | Significantly reduced weed emergence |
| Lawn Lifespan | Short-term deterioration, often fails | Long-term health and vitality |
| Surface Quality | Uneven, prone to bumps and drainage issues | Smooth, level, and consistent |
| Water/Nutrient Uptake | Compromised due to root barrier | Optimized due to direct soil contact |
Long-Term Considerations for a Healthy Lawn
Addressing the underlying reasons for replacing your lawn is crucial for long-term success. If your previous lawn suffered from poor drainage, soil compaction, or nutrient deficiencies, laying new turf without addressing these issues will only lead to recurring problems. Invest in proper soil preparation to create a foundation that supports robust, healthy grass for years to come.
By taking the time to prepare your ground correctly, you set the stage for a lush, resilient lawn that will enhance your outdoor space and provide lasting enjoyment.
