Article by Carl Mehlhope
While going through the Master Gardener training, I made what I thought was an innocent comment. I was with a group of Master Gardeners, and I casually referred to the “dirt” in the garden we were looking at. A veteran Master Gardener quickly, but kindly, corrected me.
“That’s not dirt, that’s soil.”
At the time, I had no idea what the difference was between the two. I couldn’t wait to get home and start researching. Since that day, I have been on a quest to learn as much as I can on the subject. I’m not an expert, but I have spent time with experts and read a few books, and I now know the difference between soil and dirt. It is one of the most important lessons I’ve learned as a gardener.
Very simply: Soil is alive, dirt is dead.
Dirt is degraded soil. Dirt is lifeless. Dirt is displaced soil that’s been removed from its natural place and ends up on your shoes, pants, hands, and tools.
Soil Is a Living System
Here in Solano County, we see a wide range of soils, from heavy clay that cracks in the summer heat to lighter, sandier soils that drain quickly. It’s easy to look at either extreme and think something is wrong. But the truth is, most of what we call “bad soil” isn’t lacking in potential; it’s lacking in life and organic matter.
Healthy soil is a living ecosystem. There are more microorganisms in a teaspoon of healthy soil than there are humans alive on Earth today. Let that sink in for a minute.
Beneath our feet is an entire world of living organisms: fungi, bacteria, protozoa, nematodes, arthropods, earthworms, mammals, and roots all working together. They cycle nutrients, build structure, hold water, and support the plants we depend on.
Healthy soil absorbs, holds, and filters water, nutrients, air, and carbon. It promotes good drainage and root penetration. The nutrient-dense soil supports plants' natural pest and disease resistance.
Feed the soil, not the plant.
Simple Ways to Bring Soil to Life
The good news is you don’t need to overhaul your garden to start improving your soil. Small, consistent actions can make a big difference.
Here are a few simple ways to begin:
1. Feed your soil with compost
Compost is one of the best ways to introduce organic matter and life back into your soil. Whether you make your own or source it locally, a layer of compost helps feed the entire soil ecosystem. For Fairfield residents, there is a free compost giveaway at Dunnell Nature Park on Saturday, June 6th, 2026.
2. Keep your soil covered
Bare soil is vulnerable, especially in our hot, dry summers. Mulch helps retain moisture, regulates temperature, stops weed germination, and protects the organisms living below the surface. It also provides food for them.
3. Grow roots year-round
Living roots feed soil microbes. Even between main crops, consider cover crops or leaving plant roots in place after harvest to keep that underground system active.
4. Disturb less, observe more
Frequent digging and tilling disrupts soil structure and the networks of life within it. When possible, try loosening soil gently or planting directly into amended areas.
5. Water with intention
In Solano County, water is always a consideration. Deep, infrequent watering encourages roots to grow deeper and supports more resilient soil structure.
6. Be patient
Healthy soil isn’t built in a day. It’s developed over time. The changes may be subtle at first, but they build on each other in powerful ways.
More Than Just a Word
Looking back, I’m grateful for that simple correction: “That’s soil.”
It wasn’t just about using the right term. It was about understanding what we’re really working with as gardeners. We’re not just growing plants. We’re tending to a living system.
And when we shift our mindset from treating it like dirt to caring for it as soil, everything begins to change. It is much easier to work with Mother Nature than to fight her.