What Natural Ways Can I Reduce the pH of My Garden?


Picture of different soil samples in test tubes

Every plant has a preferred range of soil acidity or alkalinity. When that range is not met, a host of ills may follow. If you are trying to reduce the pH of your garden, you are probably trying to raise blueberries, blue hydrangea, silver maple, or azaleas.

To help them grow, you need to make soil acidic, which involves lowering the soil pH. There are quite a few natural ways in which you can reduce the pH of garden soil over time.

Using organic materials like well-decomposed compost, compost tea, elemental garden sulfur, mulch, coffee grounds, and sphagnum peat moss in your garden can help lower the pH of the soil naturally.

As a gardener, one needs to understand the perennial relationship between a plant and the soil. There is a wide range of soils consisting of varying amounts of minerals, air, water, dead organic matter, and living organisms.

Understanding soil and its components can help plants thrive. Let us answer some of your questions specific to soil pH and talk about ways to increase the acidity of your garden naturally.

What is pH?

The acidity or alkalinity of a substance is measured in pH units. Measured on a scale running from 0 (extremely acid) to 14 (extremely alkaline) while 7 being neutral.

Soils usually range from a pH level of 3 to 10, depending on several factors like the soil’s parent material and the amount of annual rainfall the area receives. While some plants enjoy slightly acidic conditions, some would thrive in neutral conditions, and some in alkaline.

What does Soil pH do?

Soil pH has indirect effects on plants which can still be wide-ranging. It can affect the plant nutrient availability, crop yields, crop suitability, and soil micro-organism activity.

For instance, insufficient soil acidity can result in the yellowing of young leaves, which indicates iron deficiency. Other than this, soil pH can also influence soil-dwelling organisms like earthworms, nematodes, protozoa, fungi, and bacteria.

Their well-being can also have an impact on soil condition and hence the health of the plant.

What Are the Factors That Affect Soil pH?

The innate factors that influence the soil’s pH level include climate, soil texture, and mineral content. The natural soil pH also shows the impact of the soil-forming factors such as parent material, topography, time, climate, and organisms. Let us understand this better:

Temperature and Rainfall

Temperature and rainfall can impact the intensity of leaching and weathering of soil minerals. Thus, in warm and humid areas, the soil pH decreases over time. However, in dry environments where leaching and weathering are not so intense, the soil’s pH level is more likely to be neutral or alkaline.

Soil Texture and Organic Matter

Soils that hold a high percentage of clay and organic matter are more resilient to changes in pH. This means that they have a higher buffering capacity as compared to sandy soils.

Though you cannot change the clay content in the soil, you can easily alter organic matter content. On the other hand, sandy soils usually have a low content of organic matter, which results in a lower buffering capacity.

Thus, they have a higher rate of water percolation and infiltration which means that they are susceptible to acidification.

How to Test My Soil?

infographic of how to take a soil sample

Before you try to increase or decrease your soil’s pH, you should conduct a soil test. This will help in the determination of the current pH of the soil. Follow these steps to analyze the pH level of your soil:

  • Dig around 4 to 6 inches the surface of your garden to get a sample
  • Make sure there are no stones, large clumps, or other debris in the soil
  • Add distilled water into the soil to create a muddy mixture
  • Pour the sample through a coffee filter into a clean glass (obtaining only the solids and allowing the liquid to pass through)
  • dip the pH test strip into the liquid
  • Repeat this process a few times with different samples from your garden to get an average pH level.
  • What if My Garden is Too Alkaline?

Soils that have a pH level of more than 7 are considered to be alkaline. And if your garden soil is too alkaline, you should try spending your time, efforts, and money on something that could fetch you healthy and happy plants. Acidifying or even neutralizing your garden soil may take a lot of time.

Thus, it is better to work with local nurseries or personnel in horticulture and agriculture. This can help you know which plants are better equipped for your alkaline and calcite-rich conditions. Lavender, yarrow, kiwi, calendula are some options you can consider as they do not mind alkalinity.

How to Naturally Reduce Soil pH?

Once you have got the results, and the acidity of your soil is lesser than the recommend acidity for the plants you are planning to raise, you can go ahead with the following ways to get a lower pH level and increased soil acidity:

Well-Decomposed Compost

You should add plenty of well-decomposed compost the next time you plant. It will help lower the pH of your soil over time. Moreover, it will also offer a wide range of benefits for plant growth, improve the soil structure, and add micro-organisms into the soil that can prove extremely beneficial.

Compost Tea

You can water your plant with compost tea, which is an organic way to lower the soil’s pH level. Also, it is a really nice way to feed your plants as it offers fast-absorbing nutrients. It may even help protect the plants against some diseases and pest issues.

Elemental Garden Sulphur

One can also apply organic elemental garden sulfur. Soil bacteria change sulfur to sulfuric acid, which, in turn, lowers the soil pH. Since sulfur is an essential nutrient, it can even bolster disease resistance in plants. However, it can reduce the pH of your soil significantly, which makes it important that it is used in moderation.  

Mulch

Using organic mulch in your garden beds is yet another great way to make the soil more acidic. This breaks down gradually and can give your garden an acidic boost. You can use pine needles or oak leaves since organic mulches can have several benefits.

It can help decrease soil erosion, retain moisture, regulate temperature, and release useful nutrients into the soil.

Coffee Grounds

The next time you brew a cup of coffee, do not toss away the remaining grounds. They can do wonders for your garden. Just sprinkle them around your garden or add them to the compost pile.

As the coffee grounds will break down, they will make your soil more acidic. Moreover, your soil will get the right ingredients and benefit from better water retention, drainage, and aeration.

Sphagnum Peat Moss

Sphagnum peat moss is the dead, decayed, and fibrous plant matter of sphagnum moss. It is a great soil amendment for acid-loving plants and can help retain moisture in the soil.

However, it takes several millennia to form, so it is not considered a renewable resource. Due to environmental concerns, people feel a twinge of guilt in using peat moss for gardening or other uses.

Picture of placing soil into plastic bags

What Should I Do After Amending the Soil?

You should retest the soil every few months and keep a constant check on the soil’s acidity. This will help you know whether you used the correct method, the right quantities and whether it is still working. This is important since different amendments can last different periods of time.

How to Maintain The pH Level of My Garden?

Even when you have attained the required pH level for your garden, you cannot put it out of your mind just yet. You would need to test the soil periodically to know its pH level and amend it accordingly. Naturally alkaline soils will shift up the pH scale due to the rock minerals involved in their formation.

Thus, practices like collecting natural rainwater and watering them to imitate nature can be really useful in maintaining the soil pH. This is because the usual tap water can be very hard, which can have a high pH.

So, it is important to remember that altering soil’s pH is a slow process and might require repeated treatments or even a combination of treatments.

Altering the pH level of your soil and making it more acidic can be quite a challenge for some gardeners. This is for a number of reasons. For starts, water is often alkaline. Also, limestone within the soil is constantly breaking down which further makes it alkaline.

This can make it a constant struggle for gardeners to correct the pH level of their garden soil. However, with these organic methods, you will be able to lower the pH level of your soil organically. We hope that you can raise various acid-loving in your garden.

Conclusion to Natural Ways Can I Reduce the pH of My Garden

There are plenty of natural ways in which to reduce the pH of your garden soil. It is important to note that you do not have to do the entire garden. raised bed or even separate beds can be altered individually creating micro conditions for each plant type in your garden.

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Tony O'Neill

I am Tony O'Neill, A full-time firefighter, and professional gardener. I have spent most of my life gardening. From the age of 7 until the present day at 46. My goal is to use my love and knowledge of gardening to support you and to simplify the gardening process so you are more productive

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