Maya Ellison
Soil solarization is an effective, non-chemical method to control soil-borne pests, weeds, and diseases. It involves covering the soil with a plastic sheet, trapping the sun's heat to raise the soil temperature to a lethal level for pests and weeds. The plastic used is typically clear and can be secured with staples or lumber. While solarization is beneficial, it also kills beneficial organisms in the soil and requires a significant amount of time, usually six to eight weeks. Thicker plastic (4 mil or more) is recommended for small areas, while 1 to 4 mil painter's plastic is suitable for gardens and easily available at hardware stores.
| Characteristics | Values |
|---|---|
| Type of plastic | Clear plastic sheeting |
| Thickness | 4 mil or more for small areas; rolls of 1 to 4 mil "painter's" plastic for gardens |
| Treatment | Treated plastic with an ultraviolet (UV) inhibitor to prevent breakdown |
| Size | Slightly larger than the treated area |
| Fixing method | Staples, duct tape, lumber, or soil to bury the edges |
| Soil preparation | Levelled, moist, cleared of debris, weeds, and rocks |
| Time | 4 to 8 weeks; longer in colder climates |
| Temperature | 120°F (49°C) or higher |
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What You'll Learn
Clear plastic is best
Solarization is an organic technique that uses sunlight to heat the soil, killing weeds, seeds, and pests. The process involves covering the soil with a sheet of plastic, trapping the heat and raising the soil temperature to a level that will kill weeds, pests, and diseases.
When selecting plastic for solarization, choose clear, transparent film rather than cloudy, milky, or translucent materials, as these will reduce solar energy transmission. Rolls of 1 to 4 mil "painter's" plastic are available at hardware stores and are suitable for gardens. Thicker plastic (4 mil or more) can be used for small areas. Plastic designed for large-scale solarization is often treated with an ultraviolet (UV) inhibitor to prevent breakdown in sunlight, so this type of plastic is also a good option.
The solarization process takes at least six weeks, so it is important to select a plastic that will last this long without deteriorating. If holes or tears develop, they should be patched with durable tape. In cooler climates, two sheets of plastic can be used to help trap more heat.
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Thicker plastic for smaller areas
Soil solarization is a process that uses the sun's heat to kill weeds, weed seeds, and insects. It is an organic, non-chemical method of pest control. The sun's heat is trapped under a sheet of plastic, heating the soil to temperatures that are lethal to many pests and weeds.
When it comes to choosing the right plastic for solarization, the thickness of the plastic depends on the size of the area being treated. For smaller areas, thicker plastic can be used (4 mil or more). This thicker plastic is more durable and is less likely to break down during the solarization process. Rolls of 1 to 4 mil "painter's" plastic are readily available at larger hardware stores and are suitable for garden use. They should last for the typical solarization period of 4 to 6 weeks without deteriorating.
For larger areas, plastics designed for large-scale solarization are usually treated with an ultraviolet (UV) inhibitor so that they do not break down as quickly in sunlight. Clear, transparent plastic is recommended over cloudy, milky, or translucent materials, as it allows for better solar energy transmission. Plastic without UV protection should be monitored closely and removed before it deteriorates to a point where disposal becomes difficult.
To prepare a site for solarization, the area should be cleared of weeds, debris, and any other unwanted material. The soil should be raked smooth, with a slight crown in the center to prevent rainwater from collecting on the plastic and cooling the soil. Moist soil is ideal for solarization as moisture helps conduct heat. The plastic sheet should be slightly larger than the area being treated and stretched tightly, with the edges sealed by burying them in the soil. The process typically takes 6 to 8 weeks, during which time the soil temperature should rise to at least 120°F (49°C) to effectively kill weeds, pests, and diseases.
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Solarization in cooler climates
Soil solarization is an effective method of pest control that uses the sun's heat to kill weeds, weed seeds, and insects. It is a simple, chemical-free process that can be done in any type of garden.
To solarize soil, gardeners must first clear the area of weeds, debris, and plant material, leaving only moist soil behind. This is because moisture helps conduct heat, and moist seeds are more susceptible to it. The soil should be levelled, with the plastic sheeting laid down and secured with staples, lumber, or soil. The plastic should be clear, as this allows sunlight to pass through and be trapped in the soil, heating it to temperatures that are lethal to pests and weeds.
In cooler climates, the effectiveness of solarization depends on the length of time the plastic is left in place, with longer durations required to raise the temperature to desired levels. For example, in the cooler coastal areas of California, solarization has been used successfully during periods of high temperature and no fog. In cool locations, it may be necessary to leave the plastic in place for up to eight weeks.
The optimal thickness of plastic for solarization is not clear, but it is recommended to use thicker plastic sheeting instead of films, as these can be reused for many years. Thin plastic provides greater heating but is more susceptible to tearing. Gardeners can also increase the effectiveness of solarization by using two layers of clear plastic or one layer of clear plastic over black.
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Prepare the soil
To prepare the soil for solarization, start by clearing the area of weeds, rocks, debris, plant material, and any other unwanted objects. You can also till the top six inches of soil to increase heat penetration, though this is not necessary. Then, rake the area until it is smooth and level, ensuring the center is slightly higher to prevent rainwater from collecting on the plastic and cooling the soil. Moist soil is best for solarization, as it conducts heat better, so plan to begin this project after a good soaking rain if possible. If you are amending the soil with compost, add it before laying down the plastic sheeting.
Once the soil is prepared, stretch the plastic sheet tightly over the area, ensuring the sheet is slightly larger than the treated area. Bury the edges of the plastic completely in the soil to seal it. Use staples to secure the plastic in place, or weigh it down with lumber. Clear plastic is typically recommended, as it allows sunlight to pass through and reach the soil. However, thicker plastic (4 mil or more) can be used for small areas. If using plastic without UV protection, monitor it closely and remove it before it deteriorates.
The plastic should remain in place for at least six weeks, and up to eight weeks, to effectively solarize the soil. During this time, the sun's heat will be trapped, raising the soil temperature to levels that kill weeds, pests, and diseases. In cooler climates, it may be necessary to use two sheets of plastic to increase the heat, and in extremely hot regions, the process may take three months. If you notice holes in the plastic, cover them with duct tape or durable patching tape to prevent heat escape.
After the solarization process is complete, remove the plastic. You should see a reduction in weeds and pests, and the soil will be ready for planting. Solarization can improve the overall quality of your soil by increasing the availability of nutrients like nitrogen, calcium, and potassium. It is an effective, organic technique for treating a multitude of issues in any type of garden.
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Secure the plastic
Soil solarization is an effective method for killing weeds, weed seeds, and insects using the heat of the sun. To secure the plastic during the solarization process, follow these steps:
Firstly, ensure the plastic sheet is larger than the area you are treating. Stretch the plastic tightly over the prepared area, creating a tight seal by completely burying the edges in the soil. This will prevent wind, rain, and weed seeds from getting underneath, while effectively trapping the heat.
You can also use staples to secure the plastic in place. Garden staples will help keep the plastic taut and in position. Additionally, lumber can be used to weigh down the plastic, especially along the edges, to prevent it from being lifted by the wind.
If your plastic sheet develops any holes or tears, use durable patching tape to seal the area. Duct tape can also be used, as it usually does not block enough sunlight to negatively impact the process.
For smaller treatment areas, thicker plastic can be used (4 mil or more). Plastic designed for large-scale solarization is often treated with an ultraviolet (UV) inhibitor to prevent breakdown in sunlight. Rolls of 1 to 4 mil "painter's" plastic are commonly available at hardware stores and are suitable for garden use. Clear, transparent film is recommended over cloudy, milky, or translucent materials, as it allows for greater solar energy transmission.
Remember, solarization requires a minimum of six weeks. During this time, ensure that the plastic remains secure and in place.
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Frequently asked questions
Thicker plastic is recommended for smaller areas (4 mil or more). Rolls of 1 to 4 mil painter's plastic are available at larger hardware stores and are suitable for gardens.
Clear plastic is the best option for solarization as it allows sunlight to pass through it. Plastics designed for large-scale solarization are treated with an ultraviolet (UV) inhibitor to prevent breakdown in sunlight.
The shortest amount of time for the solarization process to work is around six to eight weeks. In hotter regions, this duration can be reduced, while in colder regions, it may need to be increased to the entire season.
Solarization uses the heat of the sun to raise the temperature of the soil, killing weeds, pests, and diseases. Solarization also increases the number of beneficial soil organisms and makes nutrients like nitrogen, calcium, and potassium more available to plants.
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