Tillie Doyle
Potting soil, also known as potting mix, is a blend of ingredients used to grow plants. It is different from garden soil in that it does not contain real soil, and is instead a soilless, sterile mixture. This is to allow for healthy root growth, providing enough air and water, as well as anchorage for roots. Making your own potting soil is easy and inexpensive, allowing you to customise the mixture to meet your needs. You can cook your own potting soil by placing moist dirt into a large pan, filling a hollow can in the centre with water, covering the pan, and cooking for around 45 minutes to kill any weed seeds and fungus.
Characteristics and Values of "Cooked" Potting Soil
| Characteristics | Values |
|---|---|
| Purpose | To create a sterile, disease-free, and weed-free environment for plants to grow |
| Ingredients | Soil, sand, compost, pine bark, perlite, vermiculite, peat moss, coconut coir, lime, fertilizer |
| Container | Large enamel pan, roasting pan, turkey cooking pan, water-bath canner |
| Method | Shovel moist dirt into the pan, fill a hollow can with water, cover, and cook on the stove for about 75 minutes |
| Benefits | Improved drainage, increased air and water flow, customized nutrient content, suitable for specific plants |
| Ratios | Various ratios depending on plants; a common ratio is 3:2:1 of coco coir/peat moss, compost, and perlite/pumice, with additional horticultural sand, charcoal, and vermiculite |
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What You'll Learn
Sterilise soil to kill weeds and diseases
Sterilising soil is an important step in preparing your own potting mix, as it kills weeds and diseases that could harm your plants. The process is simple and can be done on a stovetop or in an oven.
To sterilise soil on a stovetop, first, find a large enamel pan, roasting pan, or turkey cooking pan. Place a hollow soup can, opened at both ends, in the middle of the pan. Put an empty cottage cheese carton upside down on top of the can and fill it with moist dirt. Smooth and level the dirt before removing the carton. Then, fill the can with water and cover the pan with a lid or foil. Turn on the stove and heat the pan for about 45 minutes. You should see steam and smell the soil cooking. Continue to cook for another 30 minutes to ensure all weed seeds and fungi are killed.
Alternatively, you can sterilise soil in your oven. Spread the soil out in a tray and bake at 200°F for 20 minutes, stirring the soil every 5 minutes to ensure even heating. This method is especially useful if you have a large amount of soil to sterilise.
By sterilising your soil, you can be sure that your potting mix is free of weeds and diseases that could hinder the growth and health of your plants. This step is crucial in creating a healthy environment for your plants to thrive.
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Use a roasting pan or large pot
To cook potting soil using a roasting pan or large pot, you'll need a large enamel pan, a hollow soup can with both ends open, an empty cottage cheese carton, moist dirt, and water.
First, put the hollow soup can in the middle of the pan. Place the empty cottage cheese carton upside down on top of the can. Shovel moist dirt into the pan and around the can. The carton prevents excess dirt from filling the hollow space. Smooth and level the dirt around the can.
Next, fill the can with water. The water will immediately disappear into the dirt, providing enough moisture for steaming. Cover the pan with a lid or, if you don't have one, use two long strips of foil, crimping them tightly.
Place the pan on a hot stove and cook for about 45 minutes. You should be able to see and smell the steam at this point. Continue cooking for another 30 minutes to ensure all weed seeds and fungi are killed.
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Add water to steam the dirt
To cook potting soil, you will need a large pan, such as a roasting pan or a turkey cooking pan. Place a hollow can with both ends open in the middle of the pan. Put an empty cottage cheese carton upside down on top of the can and begin to shovel moist dirt into your pan and around the can. The carton prevents excess dirt from filling the hollow can. Remove the carton, smooth the dirt around the can, and level the dirt.
Now, fill the can with water to help the dirt cook faster and more thoroughly. The water will immediately disappear into the dirt. This is enough water for steaming the dirt. If you add too much water, the dirt becomes waterlogged and difficult to work with. Cover the pan with a lid or, if you don't have a lid, use two long strips of foil crimped on tightly.
On a hot stove, you will see the steam and smell it in about 45 minutes. Continue to cook for another 30 minutes to ensure all weed seeds and fungi are killed. After steaming, leave the soil to rest for a few days or, preferably, a week, so that the structure does not deteriorate. When you start working on the soil again, make sure that your shoes, clothing, and tools are disinfected to prevent the soil from being contaminated.
Please note that simply adding boiling water to a pot with soil is not a dependable way to pasteurize the soil. It will be uneven, and boiling water added to a pot with a plant will certainly kill the plant.
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Include sand for air space
When making your own potting soil, it's important to consider the ingredients and their proportions, as well as the specific needs of the plants you're growing. One key ingredient to include in your potting mix is sand, which adds air space and provides several benefits for your plants.
Sand plays a crucial role in creating air pockets within the potting mix. When you mix sand into the soil, it creates tiny gaps and passageways between the soil particles. These air pockets provide a spacious environment for roots to spread out comfortably. Just like all living things, roots need to breathe, and they do this by taking in oxygen, which is crucial for their growth and overall health. With the added air space, roots can absorb water and nutrients more effectively, promoting better plant growth.
The type of sand you use is important. Fine sands are generally not recommended as they can compact and suffocate roots, hindering water drainage and potentially leading to root rot. Coarse sand, such as builder's sand or horticultural sand, is the better option. It has larger, irregularly shaped particles that don't pack together as tightly, maintaining pore space within the soil even when wet. This improves aeration and drainage, creating channels for air circulation and water flow.
When mixing sand into your potting soil, the amount you add depends on the drainage requirements of your plants. A common soil-to-sand ratio to start with is 4 or 5 parts soil to 1 part sand. However, for potted trees and shrubs, a higher percentage of coarse sand is beneficial. Additionally, sand can be a good choice for top-heavy plants that might tip over since it is heavier than other ingredients.
By incorporating sand into your potting mix, you're providing your plants with the airy environment they need to thrive. The added air space allows roots to breathe and absorb the necessary water and nutrients, ultimately contributing to healthier and more robust plant growth.
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Add lime to balance pH
Soil pH plays a crucial role in plant health, nutrient availability, and overall garden productivity. Most plants thrive in a slightly acidic to neutral pH range (around 6.0 to 7.0). However, some soils are naturally more acidic, which can limit nutrient uptake and stunt plant growth.
To address this, one of the most common and effective ways to raise soil pH (make it less acidic) is by adding lime. Lime, or ground limestone, contains calcium or magnesium, which reacts with the hydrogen ions in the soil to reduce acidity and raise pH levels. This process happens gradually over weeks or months, depending on particle size, moisture, temperature, and soil type.
Before adding lime, it is important to test your soil's current pH level and nutrient content. This ensures you apply the correct amount of lime without overdoing it. Home test kits are available at garden centres, but for more precise readings, digital meters or professional soil testing services are recommended.
There are several types of lime to choose from, depending on your soil's specific needs:
- Agricultural Lime (Calcitic Lime): Made primarily from calcium carbonate (CaCO3), this is the most common type used for raising soil pH.
- Dolomitic Lime: Contains both calcium carbonate and magnesium carbonate (MgCO3). Recommended if your soil is low in magnesium.
- Hydrated Lime: Quick-acting but very caustic; not recommended for most garden use due to the risk of over-liming and damaging plants.
- Pelletized Lime: Agricultural lime that has been finely ground and compressed into pellets for easier handling and spreading.
By adding lime to your potting soil, you can effectively raise the pH, creating a more favourable environment for your plants to thrive and ensuring robust growth and vibrant plant life.
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Frequently asked questions
A large enamel pan is great for cooking dirt on the stove. You can use the largest roasting pan or turkey cooking pan that you can find. Even an old 8-quart water-bath canner works well.
Place a hollow soup can in the middle of the pan and open both ends with a can opener, removing the outside paper. Then, place an empty cottage cheese carton upside down on top of the can.
Shovel moist dirt into the pan around the can. The carton prevents excess dirt from filling the hollow can. Fill the can with water to help the dirt cook faster and more thoroughly. Remove the carton, smooth and level the dirt around the can.
Cover the pan with a lid or foil and cook on a hot stove for about 75 minutes in total. You should be able to see and smell the steam after 45 minutes. Continue cooking for the remaining 30 minutes to ensure all weed seeds and fungi are killed.
