Last Updated on September 15, 2026 by Brian Beck
Most homeowners never think about soil pH.
They think about fertilizer, water, weeds, insects, disease and why one section of the lawn always looks worse than the rest. But underneath all those visible problems is something quietly directing traffic—and occasionally creating a traffic jam.
That something is pH.
What Is Soil pH?
In simple terms, pH tells us how acidic or alkaline the soil is. The scale runs from 0 to 14, with 7 considered neutral.
Most lawn grasses perform best in a moderately acidic to neutral soil, generally somewhere around 6.0 to 7.0. Our preferred target is often close to 6.5, although the right interpretation depends on the soil, the grass and the complete soil test.
The important point is that pH affects how easily plants can access nutrients.
You can have minerals sitting in the soil, but if the pH is too high or too low, the plant may struggle to use them. It is a little like having money in the bank but discovering that your debit card has been declined.
The resources are technically there. They just are not readily available.
pH Does Not Work Alone
People often hear that lime raises pH or sulfur lowers it. That can be true under the right conditions, but soil chemistry is rarely as simple as moving one number up or down.
A high pH reading may be connected to excess calcium, magnesium, sodium, bicarbonates, irrigation water or the underlying geology. A low reading can have its own combination of causes.
That is why we do not chase pH blindly.
The pH number is an important clue, but it is not the entire investigation. We also need to examine mineral balance, base saturation, organic matter, humus, soil structure and biological activity.
The goal is not simply to force the soil to produce a better number. The goal is to build a soil system that functions more effectively.
Humus Is the Soil’s Shock Absorber
One of the most powerful tools for stabilizing soil conditions is humus.
Humus is the dark, stable material created as microorganisms break down and transform organic matter. It is not merely dead leaves or undecomposed compost. It is the finished product of a complex biological process.
Humus helps soil resist sudden swings in pH. This is called buffering.
Think of humus as the suspension system on your vehicle. Without good suspension, you feel every pothole. With it, the ride becomes much smoother.
Humus does something similar in soil. It helps soften chemical extremes while improving water retention, nutrient-holding capacity, soil aggregation and the exchange of nutrients between the soil and the plant.
This does not mean humus will magically overpower every high-pH Colorado soil. Strong alkalinity caused by carbonates or irrigation water may still require specific mineral and management strategies. But humus can make the root environment far more stable and functional.
You Can Add Humus—or Build the Engine That Makes It
There are two basic ways to increase the humus influence in soil.
The first is through manual applications of quality carbon-rich and humic materials. This can help provide more immediate support, especially in depleted soils.
The second—and more sustainable—approach is to start rebuilding the biological engine that produces humus naturally.
Healthy soil contains a diverse community of bacteria, fungi and other microorganisms. These organisms break down organic material, cycle nutrients, build aggregates and create stable carbon compounds.
Bacteria are especially active in processing simple organic materials and cycling nutrients. Beneficial fungi help handle more complex carbon compounds, extend their reach through the soil and contribute to stable soil structure.
When these organisms are properly supported, the soil begins doing more of the work itself.
That is the difference between continually carrying buckets of water to a broken fountain and finally repairing the pump.
Why Biology Sometimes Stalls
Microorganisms need the right working conditions.
They need:
- Air in the soil
- Adequate moisture
- Organic carbon
- Mineral balance
- A suitable root environment
- Food sources that support a diverse microbial community
If the soil is compacted, waterlogged, extremely dry or chemically unbalanced, biology cannot function efficiently. Adding microbes to dysfunctional soil without addressing their environment is like hiring a great workforce and locking them out of the building.
The organisms may be present, but they cannot accomplish much.
That is why our biological approach begins with soil structure, gas exchange and the conditions needed to support life. We then evaluate the biology, mineral balance and fertility inputs.
The Soil Test Comes First
Before attempting to “fix” pH, we need to understand why it is where it is.
A professional soil test helps us examine:
- The current pH
- Calcium and magnesium balance
- Potassium and sodium levels
- Sulfur availability
- Humus and organic carbon
- Nutrient availability
- The relationships between minerals
Without that information, treating pH becomes guesswork. And soil has a wonderful sense of humor about guesswork—it usually makes us pay for it twice.
Stop Chasing Symptoms
A lawn with poor pH management may require more water and fertilizer while still producing disappointing results. Weeds can exploit the weakened system, roots may remain shallow and nutrients may become less available.
That does not always mean the lawn needs another product.
It may mean the soil needs a better operating system.
Getting pH under control is not about forcing a number into a narrow range overnight. It is about creating a buffered, biologically active soil where nutrients can move, roots can breathe and the plant can function as it was designed to function.
When we build humus and restart the biological engine, we are not merely feeding the grass.
We are rebuilding the system that feeds it.
Stop Guessing. Start With the Soil.
If your lawn requires more water, more fertilizer and more treatments just to remain acceptable, the real problem may be underneath it.
Our Biological Soil Program begins with testing—not guessing. We identify the pH, mineral imbalances, biological limitations and structural problems preventing your soil from functioning properly. Then we develop a plan to rebuild the biological engine, increase humus formation and create a healthier, more resilient lawn from the soil up.
Take the first step toward a lawn that works with nature instead of constantly fighting against it.