Can you use newspaper or cardboard under mulch to kill weeds? Absolutely! Using newspaper or cardboard as a weed barrier under mulch is an effective, eco-friendly method to suppress weeds. This technique not only helps control unwanted plant growth but also enriches the soil as these materials decompose over time.
How Does Using Newspaper or Cardboard Under Mulch Work?
Placing newspaper or cardboard under mulch works by blocking sunlight, which prevents weed seeds from germinating. As these materials break down, they add organic matter to the soil, improving its structure and fertility.
Benefits of Using Newspaper or Cardboard
- Weed Suppression: Effectively blocks light, preventing weed growth.
- Soil Enrichment: Adds organic matter as it decomposes, enhancing soil health.
- Cost-Effective: Utilizes readily available materials, reducing gardening costs.
- Eco-Friendly: Recycles paper products, minimizing waste.
How to Use Newspaper or Cardboard Under Mulch
- Prepare the Area: Clear the area of any existing weeds and debris.
- Lay Down Newspaper or Cardboard: Use 2-3 layers of newspaper or a single layer of cardboard. Overlap edges to ensure complete coverage.
- Water Thoroughly: Wet the newspaper or cardboard to help it stay in place and begin decomposition.
- Apply Mulch: Spread 2-4 inches of mulch on top, ensuring complete coverage.
Tips for Best Results
- Avoid Glossy Paper: Use plain newspaper to prevent introducing harmful chemicals.
- Secure Edges: Use rocks or soil to keep the paper in place, especially in windy areas.
- Monitor Moisture: Ensure the mulch and underlying paper remain moist to promote decomposition.
Newspaper vs. Cardboard: Which is Better?
| Feature | Newspaper | Cardboard |
|---|---|---|
| Decomposition Rate | Faster decomposition | Slower decomposition |
| Ease of Use | Easier to lay and conform | Requires cutting to fit |
| Availability | Readily available | May require sourcing |
| Thickness | Thinner, may need layers | Thicker, better barrier |
Practical Example: A Case Study
In a community garden project, volunteers used cardboard under mulch to combat persistent weed issues. Over a growing season, they observed a significant reduction in weeds and improved soil quality, resulting in healthier plant growth and higher yields.
People Also Ask
Can using newspaper or cardboard harm my plants?
When used correctly, neither newspaper nor cardboard will harm your plants. Ensure they are free of toxic inks and chemicals, and avoid covering plant stems or trunks directly.
How long does it take for newspaper and cardboard to decompose?
Newspaper typically decomposes within a few months, while cardboard may take a year or more, depending on environmental conditions like moisture and temperature.
Is it necessary to remove newspaper or cardboard after it decomposes?
No, it’s not necessary. As these materials decompose, they integrate into the soil, enriching it. You can add more layers annually as part of your regular garden maintenance.
What type of mulch works best with newspaper or cardboard?
Organic mulches, such as wood chips, straw, or shredded leaves, work best. They complement the decomposition process and further enhance soil quality.
Can I use colored or printed cardboard?
It’s best to avoid colored or heavily printed cardboard, as these may contain inks or dyes that are harmful to the soil and plants.
Conclusion
Using newspaper or cardboard under mulch is a practical, sustainable method for weed control that also benefits your garden’s soil health. By following the steps outlined above, you can effectively suppress weeds and promote a thriving garden environment. For more gardening tips, explore topics like companion planting or natural pest control to enhance your gardening success.