Omar Khalid
Landscape fabric and black plastic sheets are popular methods for eliminating weeds. However, the effectiveness of these methods is questionable, as some claim that weeds can grow through the plastic. Additionally, plastic can increase soil temperature and is not water or air permeable, potentially affecting the health of the surrounding soil. Landscape fabric, on the other hand, can limit moisture and air from reaching the soil and may require constant maintenance to ensure even coverage. Therefore, it is essential to consider the specific needs of your garden before deciding whether to use plastic or landscape fabric under mulch.
Do I need plastic under mulch?
| Characteristics | Values |
|---|---|
| Plastic prevents weed growth | Plastic is often used to prevent weeds from growing, but it is not a permanent solution as weeds can grow through the plastic. |
| Landscape fabric | Landscape fabric is a popular alternative to plastic, but it does not completely prevent weed growth and can be difficult to remove weeds by hand. |
| Organic mulch | Organic mulch added directly to the soil can enrich the soil and retain moisture, but it may need to be topped up yearly. |
| Soil health | Plastic or landscape fabric can prevent the soil from getting necessary nutrients, water, and air. |
| Maintenance | Using plastic or landscape fabric under mulch may require constant maintenance to ensure even coverage and prevent exposure. |
| Plant growth | Landscape fabric may restrict plant growth and require additional work if plants need to be moved. |
| Temperature | Plastic sheets can raise soil temperature and should not be used in regions with a lot of sun. |
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What You'll Learn
Plastic under mulch can be used to eliminate weeds
Plastic, particularly black plastic sheets, is often touted as a weed barrier, and it is commonly used in landscaping to eliminate weeds. The idea is that the plastic creates a physical barrier that prevents weed growth by blocking sunlight and smothering the weeds. This can be effective in the short term, especially when combined with mulch, which can slow down the breakdown of the plastic.
However, it is important to recognize that plastic under mulch is not a permanent solution for weed control. Over time, the plastic will degrade due to exposure to the elements, including sunlight, moisture, and other environmental factors. Thin, low-quality plastic is particularly susceptible to breaking down within a few weeks or months. Once the plastic degrades, it can fall apart, becoming difficult to remove and contributing to environmental pollution.
Furthermore, plastic under mulch can have other negative consequences. For example, it can lead to increased soil compaction, making it harder for water and nutrients to penetrate the soil. Additionally, in regions with high sun exposure, the plastic sheet can raise the soil temperature to levels that are too high for optimal plant growth.
Instead of relying solely on plastic, it is recommended to use other methods for weed control in combination with mulch. Landscape fabric, for instance, can be more effective at suppressing weeds while still allowing water and air to reach the soil. However, even with landscape fabric, some weeds may still germinate, and regular maintenance is necessary to keep the garden weed-free. Ultimately, the choice between plastic and landscape fabric depends on the specific needs and conditions of the garden.
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Plastic can increase soil temperature
Plastic mulch has been used for over six decades to increase soil temperature and improve crop yield. The plastic traps heat by absorbing solar radiation and warming the soil underneath. This is particularly useful for high-value vegetable crops such as tomatoes, peppers, melons, squash, and cucumbers.
The effectiveness of plastic mulch in increasing soil temperature depends on several factors, including the type of plastic, the colour, and the installation method. Firstly, the type of plastic used can influence heat absorption and transfer. Smooth plastic is commonly used, but it is prone to cracking due to expansion and contraction under fluctuating temperatures. Embossed plastics are less likely to crack and maintain better contact with the soil for more efficient energy transfer.
Secondly, the colour of the plastic mulch plays a significant role in temperature regulation. Transparent or clear plastic films allow the most significant amount of the solar spectrum to penetrate, resulting in the highest increase in soil temperature. Black plastic mulch, the most prevalent type, absorbs sunlight and transfers the heat to the soil through conduction. This process is optimized when there is tight contact between the plastic and the soil surface. Black mulch generally increases soil temperature by 3 to 5 °F (1.7 to 2.8 °C) compared to bare soil. Red plastic mulch performs similarly to black mulch in terms of soil warming but is more expensive. White-on-black films and silver films reflect most of the solar spectrum, resulting in cooler soil temperatures than bare soil.
Finally, proper installation is critical to the success of plastic mulch. Preparing the soil bed by fine-tuning and slightly compressing it can improve heat conduction to the soil. Pre-shaping the bed with coulters or a hipper ensures that the plastic is in direct contact with the soil, as air pockets between the plastic and the soil will reduce heat transfer efficiency. Additionally, warming the plastic before laying it can help achieve tighter contact with the soil.
While plastic mulch can effectively increase soil temperature, it is important to consider its disadvantages. Plastic mulch can increase input costs due to specialized equipment, labour for installation and removal, and disposal. Improper installation can lead to clumpy soil and loose plastic, reducing the effectiveness of heat conduction. Additionally, the use of plastic contributes to environmental concerns, with disposal costs being relatively high. As a result, there is a growing trend towards developing biodegradable plastic mulches made from plant starches, which can be ploughed into the ground after harvest.
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Plastic is not permeable to water or air
While some people put plastic under mulch in their gardens, it is not advisable. Plastic is not permeable to water or air, which means that it does not allow water or air to pass through. This is a problem because, when used in gardens, mulch needs to allow water to reach the soil and roots of plants. Plastic also does not break down over time and can cause weeds to grow, which are then difficult to remove.
The idea that plastic is not permeable to water or air is a common misconception. It is true that plastic does not allow liquid water to pass through. However, plastic is formed by long polymer chains that have voids or spaces between them. These voids allow small molecules, such as oxygen and water vapour, to pass through the plastic. This is known as gas permeability. The rate at which molecules pass through plastic depends on the concentration gradient and the pressure gradient. For example, water will permeate through plastic over time, and oxygen will permeate in the opposite direction until equilibrium is reached.
The gas permeability of plastic is influenced by various factors, including the type of polymer used in its production, the temperature, and the relative humidity. Different types of polymers have different barrier properties, with some allowing more water vapour to pass through than others. For instance, nylon has a high water absorption rate, while high-density polyethylene (HDPE) allows very little water vapour transmission.
The gas permeability of plastic has important implications for its use in packaging. Oxygen that permeates through plastic packaging can reduce the shelf life of food by causing it to spoil more rapidly. Water vapour that permeates into packaging can cause issues such as caking in dry powder products and changes in the composition of fluids. Therefore, it is crucial to consider the product's environment and select a suitable material to ensure its longevity.
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Plastic degrades quickly
While some people put down a layer of plastic under mulch in their gardens, this is not recommended. Plastic is not permeable to water and air, and it can degrade quickly, especially when exposed to UV light. Plastic can fall apart into little pieces within a few months, and it can be a huge pain to remove weeds that grow through it.
Plastic is designed to last, and it can take hundreds of years to decompose. Even then, plastic never fully disappears; it just gets smaller and smaller. Plastic waste can take anywhere from 20 to 500 years to break down, depending on the type of plastic and the environment it is in. For example, plastic straws can take up to 200 years to decompose, while the plastic in coffee pods can take more than 500 years.
The long decomposition time of plastic is a significant environmental concern. Plastic pollution is widespread, and it is estimated that 8.3 billion tonnes of plastic have been produced globally, with half of that amount generated in the last 13 years. Plastic waste can end up in landfills, oceans, and other natural environments, posing risks to wildlife and human health.
To address the problem of plastic pollution, it is essential to reduce plastic consumption, improve recycling rates, and develop new ways to degrade plastic faster. By taking these actions, we can work towards a more sustainable relationship with plastic and minimize its negative impact on the environment.
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Plastic can be used to improve the appearance of a garden
Additionally, the use of plastic under mulch can have some drawbacks. For example, if thin or low-quality plastic is used, it may fall apart within a few months or be easily penetrated by larger weeds. Plastic sheets can also cause the soil temperature to rise, which may be detrimental to plants. Furthermore, the use of plastic or landscaping fabric under mulch can prevent the natural breakdown of mulch and the enrichment of the soil beneath it.
When using plastic under mulch, it is recommended to use thick, high-quality plastic to reduce the risk of penetration by weeds and to extend the lifespan of the plastic. It is also important to consider the climate and season when using plastic sheets, as they can raise soil temperatures, and may not be suitable for regions with high sun exposure.
Overall, while plastic can be used under mulch to improve the appearance of a garden by suppressing weeds, it is important to carefully consider the potential drawbacks and take the necessary precautions to ensure its effectiveness and avoid any negative impact on the garden.
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Frequently asked questions
No, plastic under mulch is not necessary and can even be harmful to your garden. Plastic is primarily used to eliminate weed growth, but it is not a permanent solution as it will break down due to exposure to elements like UV rays. Plastic can also raise the soil temperature too much, affecting your plants.
A popular alternative to plastic is landscape fabric, which is more durable and can be used to suppress weeds. However, fabric will not completely stop weeds from sprouting and can limit the moisture and air from reaching the soil.
Adding organic mulches straight onto the soil is beneficial as they will break down over time and enrich the soil, as well as retain moisture. Perennial plants will also be able to increase their size without being restricted by holes in the fabric.
Plastic under mulch can be unsightly if it starts to degrade and fall apart, especially if it is thin and low-quality. It can also be a hassle to remove and clean up, especially if it has been covered by rocks or other landscaping.
