How to test Soil pH at Home

Ever wondered why your plants aren’t thriving despite your best efforts? It could all boil down to your soil’s pH level. Testing your garden’s soil pH is crucial because it affects how well your plants can absorb nutrients.

You’ll be pleased to know it’s not rocket science to get this sorted. With a simple Gardman Soil pH Testing Kit or even a range of universal pH test strips, you’re well on your way to understanding your soil better.

Remember, different plants need different soils to flourish. So, before you plan your next garden masterpiece, let’s get that pH checked to ensure your greenery has the perfect ground to grow.

Benefits of Testing Soil pH

Maintaining the correct soil pH can significantly influence your gardening success. Each plant species has its ideal soil pH range to flourish, and knowing yours can be the difference between a thriving garden and a failing one.

Improved Nutrient Uptake

Testing soil pH allows you to understand whether your soil is acidic or alkaline, which directly affects nutrient availability for plants. Nutrients like nitrogen, phosphorus, and potassium are vital for plant growth and have varying availability depending on the soil pH.

For instance, at a pH range of 6 to 7.5, the availability of micronutrients such as calcium, magnesium, and iron is maximised. Soil organisms, essential for breaking down organic matter and releasing nutrients, are also most active within this range. If the pH is not in the optimal range, no matter how much fertilizer you add, plants could still suffer from nutrient deficiencies, as they cannot absorb what they need.

Enhanced Plant Health

A soil pH test also helps you steer clear of potential diseases and growth problems. For example, clubroot, a disease affecting brassicas, thrives in acidic soils. By keeping your soil pH closer to neutral, you might prevent the conditions that various plant diseases favour. Moreover, understanding the soil’s pH can guide you in selecting the most compatible plants for your garden. Those suited to your soil’s natural pH will be far healthier and more vigorous.

Knowing your soil’s pH can lead to proactive measures, such as adding greensand for extra potassium if needed or combatting high alkalinity with sulfur. Plants in well-balanced soil are naturally more resilient, enjoying stronger growth and better disease resistance, which ultimately translates to a more beautiful and productive garden over time.

A balanced soil pH plays a significant role in plant health. Don’t overlook what lies beneath your feet. Test your soil and give your plants the best chance to reach their full potential.

Equipment Needed for Testing Soil pH

Gathering the right equipment will ensure the whole process goes smoothly when you’re about to embark on soil pH testing. Here’s what you’ll need:

Soil Testing Kit

A soil testing kit is your starter pack for delving into the world of gardening chemistry. Many kits contain potassium chloride and barium sulphate, which work together to provide a clear indication of your soil’s acidity or alkalinity. With a testing kit, you’ll typically mix your soil sample with distilled water and the provided chemicals. Each one can complete about 15 tests, which should cover a variety of areas in your garden.

Here’s what a basic soil testing kit includes:

  • A clean container or test tube
  • Testing solutions
  • A colour chart for result interpretation

To use it effectively, follow the instructions carefully – adding the prescribed amount of soil and chemicals. Then, shake the mixture and let it settle. You’ll compare the resulting colour with the chart to determine your soil’s pH level.

Photo Title Price Buy
Garden Tutor Soil...image Garden Tutor Soil pH Test Kit (3.5-9 Range) | 100 Soil pH Test Strips £12.89
Suplong Soil pH...image Suplong Soil pH Meter 3 in 1 Plant Soil Testing Kit With pH, Light & Soil Moisture Meter For Garden Care, Farm, Lawn, Indoor & Outdoor (No Battery Needed) £9.99
Soil PH Meter,...image Soil PH Meter, Soil Moisture Meter, 3-in-1 Soil PH Tester, Plant Soil Testing Kit with Moisture/Light/PH, Suitable for Lighting and PH Testing of Gardens, Farm Potted Plant (No Battery Needed) £9.99
Luster Leaf 1601...image Luster Leaf 1601 Rapitest Test Kit for Soil pH, Nitrogen, Phosphorous and Potash, 1 Pack £24.99

pH Meter or Probe

If you want a more technical approach or require detailed multi-parameter analysis, a pH meter or probe is your go-to tool. Portable soil pH meters, with automatic temperature compensation, offer laboratory precision right in your backyard. They’re superb for gardener enthusiasts looking for precise data logging and result traceability.

Consider purchasing a pH meter or probe because:

  • They’re able to measure with resolutions as low as 0.001 pH units.
  • Some models provide Good Laboratory Practices (GLP) data, including calibration details and timestamps.

Before using a probe, consult the manufacturer’s guidelines for proper depth and use. Typically, you’ll insert the probe into the soil or soil sample and wait for the reading. It’s straightforward and takes the guesswork out of soil analysis. Remember, there’s no one-size-fits-all when it comes to gardening tools, so choose the equipment that best suits your gardening style and needs.

Photo Title Price Buy
Garden Tutor Soil...image Garden Tutor Soil pH Test Kit (3.5-9 Range) | 100 Soil pH Test Strips £12.89
Suplong Soil pH...image Suplong Soil pH Meter 3 in 1 Plant Soil Testing Kit With pH, Light & Soil Moisture Meter For Garden Care, Farm, Lawn, Indoor & Outdoor (No Battery Needed) £9.99
Soil PH Meter,...image Soil PH Meter, Soil Moisture Meter, 3-in-1 Soil PH Tester, Plant Soil Testing Kit with Moisture/Light/PH, Suitable for Lighting and PH Testing of Gardens, Farm Potted Plant (No Battery Needed) £9.99
Luster Leaf 1601...image Luster Leaf 1601 Rapitest Test Kit for Soil pH, Nitrogen, Phosphorous and Potash, 1 Pack £24.99

Steps to Test Soil pH

Testing your garden’s soil pH is crucial for understanding the health of your soil and ensuring your plants have the best environment to thrive. Here’s how you can easily perform this test with accuracy.

Step 1: Collect Soil Samples

The first part of testing soil pH involves getting a good representative sample of your garden’s soil. Here’s what you need to do:

  • Clear away any surface debris like leaves or plant residues.
  • Avoid areas with ashes, manure, or compost.
  • Dig a V-shaped hole about 6 to 8 inches deep using a shovel or trowel.
  • From the side of this hole, take a 1-inch wide slice of soil.
  • Extract a 1-inch strip from the center of this slice.

Remember, it’s best to gather multiple samples from different parts of your garden, especially if you’re using raised beds. Mix all the samples in a clean container to get a comprehensive picture of your garden’s average soil pH.

Step 2: Prepare the Soil Sample

Once you’ve collected your soil samples, here’s how to prep them:

  • Dry the soil indoors for a few days.
  • Crumble the sample and remove any stones or organic debris.
  • Measure out a consistent quantity, typically a cupful, and place it in a sealed plastic bag.

If you’re mailing your sample for analysis, ensure it’s well-labelled with your information and sent alongside the relevant forms and fees.

To test the soil pH yourself, you’ll want to:

  • Take equal parts of soil and distilled or deionized water.
  • In a clean container, mix 25 grams of soil with 25 mL of water.
  • Stir vigorously for a few seconds.
  • Allow the mixture to settle for about 15 minutes before proceeding with the pH test.

Step 3: Use a Soil Testing Kit

Soil pH can be measured with a simple testing kit that’s available at most garden stores. Here’s the gist:

  • Obtain soil pH test strips or a colourimetric test kit.
  • Follow the kit’s instructions carefully by adding the soil-water mixture to the testing container.
  • Compare the resulting colour with the included chart to determine the soil’s pH level.

Each kit varies slightly, so it’s important to follow the specific directions provided with your chosen kit.

Step 4: Using a pH Meter

For more precise measurements, a soil pH meter might be your tool of choice. With resolutions as low as 0.01 pH units, these meters offer greater accuracy. Here’s your guide to using one effectively:

  • Calibrate the pH meter according to the manufacturer’s guidelines.
  • If you’re using a direct soil pH meter, create a hole in the soil to the appropriate depth.
  • Add a little distilled water to moisten the soil if it’s dry, ensuring it’s damp but not waterlogged.
  • Insert the meter probe into the soil, wait for the reading to stabilize, and record the measurement.

Automatic temperature compensation is a feature of many quality portable soil pH meters, simplifying the process and ensuring accurate readings regardless of the weather conditions. Some meters even offer data logging and Good Laboratory Practices (GLP) data for traceability, ideal features if you need to log or report your findings.

Remember that consistent sampling and testing techniques are vital for accuracy, ensuring that you’re comparing like with like and tracking changes in soil pH over time effectively.

Interpreting Soil pH Results

Once you’ve conducted your soil pH test, it’s time to decipher what those numbers mean for your garden. As you know, the pH scale runs from 0 to 14, with 7 being neutral. But what should you do with this information? Let’s explore the implications of different pH levels for your soil.

Acidic Soil (pH below 7)

When your soil pH test indicates a reading below 7, you’ve got acidic soil on your hands. This means it’s rich in hydrogen ions and tends to be light and well-drained. Acidic soil is often found in areas of high rainfall and can lead to nutrients like phosphorus and calcium being less available to plants.

Soil pHConditionAction to Take
3.0-5.0Very AcidicAdd lime to increase pH
5.1-6.0AcidicIdeal for acid-loving plants

In these conditions:

  • Essential trace elements are readily available.
  • It may be deficient in crucial minerals if it is very acidic.
  • Suitable for plants such as azaleas and rhododendrons.

Neutral Soil (pH of 7)

A pH of 7 is the sweet spot on the pH scale where the soil is considered neutral, meaning it’s neither acidic nor alkaline. The neutral pH is what many gardeners strive for, as it supports a wide variety of plants and is generally well-balanced in terms of available nutrients.

Neutral soil features:

  • Optimal nutrient availability for a range of plants.
  • Good structure and moisture retention.
  • Does not typically require amendments for pH.

Here, you’ll find that your options for planting are vast, as most plants will thrive in these conditions.

Alkaline Soil (pH above 7)

If your soil pH test reads above 7, then you’ve got alkaline soil. This type is characterised by a higher concentration of calcium carbonate, which can restrict access to certain nutrients like iron.

Soil pHConditionAction to Take
7.1-8.0AlkalineMay require acidifying agents

With alkaline soil:

  • Micro-nutrient availability can be limited.
  • Certain minerals such as phosphorus might be lacking.
  • Suited to plants like lavender and clematis.

In this scenario, you might need to add acidifying agents to make certain nutrients more available to your plants.

Remember, altering soil pH isn’t a one-off task; it requires ongoing attention to maintain the desired balance. Each plant species has its pH preference, so having this knowledge at your fingertips is crucial when planning your garden for the future.

Adjusting Soil pH

As you delve into the world of gardening, understanding that the pH level of your soil is a critical factor for plant health is paramount. After you’ve tested your soil and have deciphered the pH level, you might find that adjustments are necessary to create the perfect growing conditions for your garden.

Lowering Soil pH

If you’ve discovered that your soil is too alkaline for your plants, fear not. Lowering the soil pH is all about increasing its acidity. You’ll want to use amendments that effectively acidify the soil. Elemental sulfur is one of the most common materials for this task. It works by releasing acidity into the soil as it breaks down, which can take time, hence the need for a bit of patience. Moreover, aluminium sulfate acts faster than sulfur, but use it with caution as excess can pose toxicity risks.

Organic materials can also help to lower your soil’s pH. Well-known acidifying organics include:

  • Pine needles
  • Peat moss
  • Sphagnum moss
  • Leaf mold
  • Sawdust from certain trees

Don’t forget to retest the pH level after a few weeks to ensure it’s heading in the right direction.

Raising Soil pH

On the other hand, should your soil be more acidic than desired, you’ll be looking to nudge the pH upwards. Agricultural lime is your go-to for increasing soil pH and is available as calcitic or dolomitic, with the latter also supplying magnesium. It’s crucial to apply the correct amount, as too much can create a new imbalance.

Another method for raising the pH is the use of wood ashes, a natural product from burnt wood. They contain potassium and can improve the alkalinity of the soil when used in moderation.

Common materials to raise soil pH include:

  • Agricultural lime (calcium carbonate)
  • Hydrated lime (for quicker results)
  • Wood ashes

Always apply these materials judiciously. Start with smaller amounts, gradually working your way to the appropriate pH level. Continuous monitoring and pH testing are essential to avoid overshooting the neutral mark of 7.0.

Remember, soil pH doesn’t change overnight. It requires continuous attention, and adapting the soil environment to suit your gardening goals is a practice of patience and precision.


You’ve now got the know-how to test your soil’s pH like a pro. Whether you’re reaching for a testing kit or a pH meter, you’re equipped to get those accurate readings that’ll guide your gardening decisions. Remember, it’s all about consistency in your sampling and testing to keep your garden thriving. And when it’s time to adjust the pH, you’ve got a toolbox of materials at your disposal. Just keep an eye on your soil, tweak as needed, and watch your plants flourish. Happy gardening!

Frequently Asked Questions

What household items can be used to test pH?

You can use pH test paper, small paper cups, baking soda, a measuring spoon, a marker, and various household liquids such as distilled water, window cleaner, and toilet bowl cleaner to perform a basic pH test at home.

What is the fastest way to raise pH in soil?

The fastest way to raise the pH in soil is by adding garden lime (calcium carbonate) or dolomitic lime (calcium magnesium carbonate), which will react with the soil to increase its pH level.

How can I test the pH of my soil at home?

You can test your soil’s pH at home using a soil testing kit or a pH meter. To do so, collect a soil sample, prepare it according to the instructions provided with your chosen testing method, and then compare the results to the pH scale.

What is the easiest way to test pH?

The easiest way to test pH is by using litmus paper. Simply dip the appropriate type of litmus paper (red for acids, blue for bases) into your solution, and the paper will change colour indicating the solution’s pH level.

Is clay soil acid or alkaline?

Clay soil is generally alkaline with pH levels typically ranging from 7.5 to 10. However, this can vary depending on the specific type of clay and environmental conditions.