Damon Mcknight
Soil pH is a crucial factor in a plant's ability to absorb nutrients. Many plants, including blueberries, rhododendrons, and azaleas, require more acidic soil to thrive. While many soils in Australia are naturally acidic, some regions, such as South Australia and parts of Western Australia, have alkaline soils. Gardeners in these areas may need to amend their soil to increase acidity and create optimal conditions for acid-loving plants. Before attempting to adjust soil pH, it is essential to test the soil to determine its current acidity level. Various methods can then be employed to increase acidity, such as adding organic matter, using acidic fertilisers, or applying elemental sulphur.
| Characteristics | Values |
|---|---|
| Ideal soil pH for most landscape plants and turf grasses | 6.5 |
| pH level for blue flowers on hydrangeas | 5.2 to 5.5 |
| pH level for growing acid-loving plants | 5 to 7 |
| pH level for growing most plants | 6 to 7.2 |
| pH level for soil to be considered acidic | 0 to 6.9 |
| pH level for soil to be considered alkaline | 7.1 to 14 |
| pH level for soil to be considered neutral | 7 |
| pH level indicating extremely alkaline soil | 7.1 to 8 |
| pH level indicating iron deficiency | Above 7 |
| pH level when most plant nutrients become more soluble and easily washed away | 3 to 5 |
| pH level when bacteria cannot rot organic matter | Below 4.7 |
| Ways to make soil more acidic | Adding compost, using fertilizers, applying elemental sulfur, mulching with pine needles or oak leaves, using Yates Soil Acidifier Liquid Sulfur, adding coffee grounds to compost |
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Test your soil pH
Testing your soil's pH is essential to ensuring your plants' health. The pH level of the soil is a measure of its acidity, with a pH value below 7.0 indicating acidity and a value above 7.0 indicating alkalinity. Neutral pH, where the amount of nutrients available is ideal for most plants, is 7.0.
You can test your soil's pH by purchasing a pH test kit from a local nursery, Bunnings, or The Home Depot. These kits come with instructions and a scale to help you determine your soil's pH. Here is a general guide on how to use a pH test kit:
- Collect 3 to 5 soil samples from different parts of your garden, each about a teaspoon full and taken from just below the soil surface. Remove any grass, rocks, twigs, or debris from your samples.
- Thoroughly mix your samples to ensure you have enough soil to test as per the kit's requirements.
- Spread the soil on a white tile or piece of paper and allow it to dry for at least 24 hours.
- Add a few drops of the indicator dye provided in the kit onto the soil sample.
- Cover the soil and dye with the white powder (barium powder) provided in the kit.
- Wait about 30 seconds to several minutes for the colour to change.
- Use the colour chart provided in the kit to match the resulting colour and determine the pH number.
The pH test will indicate whether your soil is acidic or alkaline, and you can then take steps to adjust the pH accordingly. For example, if your soil is too alkaline, you can add compost, manure, leaf litter, or mulch to increase acidity. On the other hand, if your soil is too acidic, you can add agricultural lime, dolomite, or poultry manure to make it more alkaline.
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Use organic mulch
Making your soil more acidic can be challenging, especially since water is often alkaline and limestone within the soil can increase alkalinity. However, using organic mulch is a great way to lower the pH of your soil.
Organic mulches are integral to organic gardening. In nature, no piece of soil is ever left uncovered, and plants or leaves fill any gaps. In your garden, you can replicate this by using mulch to cover any exposed soil. This will help reduce water loss, suppress weeds, reduce soil compaction, and protect the soil from erosion.
When choosing a mulch, it's important to consider what you are trying to achieve, what you are growing, your soil type, and the area you want to cover. For example, if you want to make your soil more acidic, you should choose an acidic mulch such as pine needles, oak leaves, bark, woodchips, or cottonseed meal. These mulches will break down over time, slowly releasing beneficial nutrients and making your soil more acidic.
It's important to note that you should avoid using cottonseed meal if you have an organic garden, unless it comes from an organic farm, as it may contain harmful pesticides or herbicides. Additionally, be sure to keep mulch away from tree trunks to prevent collar rot, a fungal disease.
You can also use compost as a mulch. Well-decomposed compost will help lower the pH of your soil over time and can be used to make compost tea, which can be used to water your plants.
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Add compost
The pH level of your soil is important to understand because it determines which plants you can grow. The pH scale ranges from 0 to 14, with 7.0 being neutral. pH levels that are 0 to 6.9 are acidic, and measurements in the range of 7.1 and 14.0 are more alkaline. The ideal soil pH for most landscape plants and turf grasses is around 6.5, which is considered slightly acidic. However, some plants require more acidic soil to thrive. For example, if you want blue flowers on your hydrangea, the soil needs to have a pH level between 5.2 and 5.5.
Before amending the soil, consider growing acid-loving plants in special raised beds or containers filled with an ericaceous compost mix. If you have a more neutral or slightly acidic soil, amending soil for ericaceous plants is more achievable.
Compost can slightly acidify soil over time. Well-decomposed compost helps lower the pH of garden soil over time. Amending your soil each season with compost, which is rich in organic matter, is one way to make your soil more acidic because it is done gradually and creates the most benefits for plant growth. It also improves the soil structure and adds beneficial microorganisms to the soil.
The pH of compost depends on the materials used. If you use wood products like sawdust, the finished compost will be more acidic. If you use more manure or add in some ashes from the fireplace, it will be more alkaline.
You can also water your plants with compost tea to make the soil more acidic. Take a five-gallon bucket of water and leave it in the sun for 24 hours to allow any chlorine to dissipate. Add 1-2 cups of well-decomposed compost per gallon of water and stir periodically over 48 hours. Strain the soil from the liquid, pour the liquid into a sprayer or watering can, and water your garden with it. Work the solids into the soil at the dripline around the plant.
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Apply sulphur
Sulphur, or sulfur, is a great option for lowering the pH of your soil. It is an essential nutrient that can bolster disease resistance in plants and is the least expensive way to lower soil pH. Sulphur takes time to lower the soil's pH, so it should be added the year before you want to plant. It is best to apply sulphur in the summer or fall before the following spring planting season, digging it deep into the soil.
Before applying sulphur, it is important to test your soil to determine the current pH level and how much sulphur needs to be applied to reach the desired pH. The pH scale ranges from 0 to 14, with 7.0 being neutral. pH levels that are 0 to 6.9 are acidic, and measurements in the range of 7.1 to 14.0 are more alkaline. The ideal soil pH for most landscape plants and turf grasses is around 6.5, which is considered slightly acidic. However, some plants, like hydrangeas, require more acidic soil to thrive.
When applying sulphur, it is important to follow the instructions on the package. Sulphur can lower the pH of your soil dramatically, but it can also have adverse effects on your plants if you use too much. Sulphur is available in two grades: dusting grade and powdered grade. The dusting grade is a finer quality and is perfect for controlling folia fungi on plants like pumpkins. It is also useful for controlling mites. However, if the temperature is 30 degrees Celsius or more, it can burn the leaves, so it is important to avoid using it on hot days.
By applying sulphur to your soil, you can effectively lower the pH and create an optimal environment for plants that thrive in more acidic conditions.
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Grow acid-loving plants
If you're looking to grow acid-loving plants, you'll need to ensure your soil has a pH level that falls within the acidic range. The pH scale ranges from 0 to 14, with 7.0 being neutral. Any pH level below 7 is considered acidic, with the ideal pH level for acid-loving plants being around 5 to 6.5.
To determine the pH level of your soil, you can purchase a pH testing kit from your local garden centre or hardware store. Alternatively, you can perform a simple test by placing a small amount of soil in a jar of vinegar. If the soil reacts by frothing up, it is alkaline, and you will need to take steps to lower the pH and make it more acidic.
One way to lower the pH of your soil is by adding organic matter such as well-decomposed compost. Compost provides essential nutrients that your soil may be lacking and helps to lower the pH over time. Amending your soil with compost each season is an excellent way to gradually make your soil more acidic while improving soil structure and adding beneficial microorganisms.
Another effective method to increase acidity is by applying organic, elemental garden sulphur. Sulphur is a safe and efficient way to lower the pH of your soil and can bolster disease resistance in plants. However, it is important to follow the instructions on the package, as excessive use can have adverse effects on your plants.
Additionally, using organic mulch in your garden beds can help make the soil more acidic. Mulching with pine needles or oak leaves can provide an extra acidic boost while offering other benefits such as reducing soil erosion, retaining moisture, and regulating temperature.
By following these methods, you can create the ideal growing environment for acid-loving plants. Some examples of plants that thrive in acidic soil include azaleas, camellias, rhododendrons, and pieris. These plants will flourish and add a burst of colour to your garden when provided with the proper soil conditions.
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Frequently asked questions
If your plants are looking sickly, yellow or dying, it's time to test your soil's pH. You can purchase a pH tester kit or take a sample to a local university laboratory.
The ideal pH level for soil is around 6.5, which is considered slightly acidic. However, some plants require a pH level of 5.5 or lower to thrive.
There are several ways to make your soil more acidic, including adding compost, using fertiliser, or applying organic, elemental garden sulphur.
Plants that require more acidic soil include blueberries, rhododendrons, azaleas, magnolias, spruce trees, Japanese pachysandra, dogwood, bleeding hearts, roses, holly, and hydrangeas.
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