Daily gardening tips: Apply a layer of cardboard under mulch to prevent weeds

Gardening is a fulfilling and satisfying hobby, but dealing with weeds can be a constant challenge

Daily gardening tips: Apply a layer of cardboard under mulch to prevent weeds

In this article:


Gardening is a fulfilling and satisfying hobby, but dealing with weeds can be a constant challenge. However, there is a simple and eco-friendly solution to prevent weeds and promote healthy plant growth: applying a layer of cardboard under your mulch. This gardening tip has been practiced and proven effective by many gardeners. In this article, we will discuss the benefits of using cardboard, how to properly apply it, and some additional tips for maintaining a weed-free garden.

Benefits of Using Cardboard

Cardboard is an organic and biodegradable material that works wonders in preventing weeds. Here are some key benefits of using cardboard in your garden:

1. Weed Suppression

Cardboard acts as a physical barrier, blocking sunlight from reaching weed seeds in the soil. Without sunlight, weeds cannot germinate and grow. By effectively suppressing weed growth, you reduce competition for nutrients, water, and sunlight for your plants, promoting their overall health and productivity.

2. Soil Moisture Retention

Cardboard helps retain moisture in the soil by minimizing evaporation. This is especially important in hot and dry climates where water conservation is crucial. By maintaining adequate soil moisture, your plants will stay hydrated, reducing the need for frequent watering.

3. Organic Material

Using cardboard as a weed barrier adds organic material to your garden. Over time, the cardboard will break down and decompose, contributing to the overall health and fertility of the soil. This natural decomposition process also attracts earthworms and other beneficial soil organisms, further enhancing your garden's ecosystem.

How to Apply Cardboard

Now that we understand the benefits, let's go through the steps to properly apply cardboard under mulch in your garden:

1. Gather Materials

You will need the following materials:

  • Cardboard (boxes or sheets)
  • Garden mulch (straw, wood chips, or compost)
  • Garden shears or utility knife
  • Water source

2. Prepare the Area

Clear the area of any existing weeds or grass. It is essential to have a weed-free soil surface for the cardboard to be most effective.

3. Break Down Cardboard

Using garden shears or a utility knife, cut the cardboard into manageable pieces. Remove any tapes, staples, or glossy sections as they may contain harmful substances or hinder decomposition.

4. Wet the Cardboard

Thoroughly wet the pieces of cardboard before placing them on the soil. This step helps the cardboard mold to the ground, preventing it from being blown away by wind or shifting out of place.

5. Lay the Cardboard

Carefully place the wet cardboard pieces on the soil, making sure to overlap the edges to create a continuous barrier. Ideally, the cardboard layer should be around 2-3 sheets thick to ensure effective weed suppression.

6. Apply Mulch

Now it's time to spread the mulch of your choice over the cardboard layer. Ensure a generous and even distribution, aiming for a mulch depth of around 2-3 inches. This depth is sufficient to prevent weed growth and provide a moisture-retaining layer.

7. Maintain and Monitor

Regularly check and monitor your garden for any signs of weed growth. Although the cardboard-mulch layer will significantly suppress weeds, some persistent weeds may still emerge. Simply pull them out by hand or use appropriate weeding tools to keep your garden weed-free.

Additional Tips for a Weed-Free Garden

Along with applying cardboard under mulch, here are some additional tips to help maintain a weed-free garden:

1. Regularly Mulch

Periodically replenish the mulch layer in your garden to maintain its effectiveness. Mulch naturally decomposes over time, so adding fresh mulch will ensure continuous weed suppression and moisture retention.

2. Use Landscape Fabric

Landscape fabric is an alternative to cardboard that provides similar weed suppression benefits. Consider using this fabric in areas where you need a more long-term solution, such as perennial flower beds or shrub borders.

3. Proper Plant Spacing

Ensure adequate spacing between plants to prevent overcrowding. When plants are too close together, it creates opportunities for weeds to thrive. Proper spacing also allows better air circulation, reducing the risk of fungal diseases.

4. Regular Maintenance

Stay on top of garden maintenance by removing any visible weeds immediately. As soon as you spot weeds, pull them out before they can spread and establish deep roots, which can be more challenging to remove.

5. Consider Raised Beds

Utilizing raised beds can help reduce weed growth as they provide a clear separation between the garden soil and the surrounding areas. Raised beds also offer good drainage and prevent soil compaction.

6. Apply Organic Herbicides

If persistent weed issues persist, consider using organic herbicides that are safe for the environment and your plants. Always follow the instructions on the product label and use precaution when applying.


By applying a layer of cardboard under mulch, you can effectively prevent weeds in your garden while promoting healthy plant growth. It is a simple, affordable, and environmentally-friendly solution that gardeners have embraced for years. Remember to gather all the necessary materials, properly prepare the area, and maintain regular monitoring and maintenance. With these tips, you'll enjoy a weed-free garden that thrives with lush and vibrant plants.

More Tips

You might also like

  • How to grow Damsons

    Welcoming you to the world of growing Damsons, this article aims to provide you with all the information you need to successfully cultivate these delicious fruits in your backyard or garden

  • How to grow Lychees

    Lychees are delicious and tropical fruits that are highly sought after for their unique flavor and juicy texture

  • How to grow Passionfruits

    Passionfruit is a delicious tropical fruit that is enjoyed by many for its unique flavor and versatility

  • How to grow Chinese Evergreens

    Chinese Evergreens (Aglaonema) are popular indoor plants known for their vibrant foliage and ability to thrive in low light conditions

Gardening jobs for May

Read our checklist of gardening tasks to do in your garden this May →.

Daily gardening tips: day 149

Remove weeds before they seed and spread