5 Warning Signs Your Soil Needs Help (and How to Fix It)

Soil quality is key for healthy plants and a thriving garden, as it serves as a living ecosystem that provides vital nutrients such as nitrogen, phosphorus, and potassium. Good soil optimizes water retention and supports robust plant and root development. When healthy, soil enhances plant immunity, reduces pest and disease pressure, and fosters beneficial microorganisms that promote overall plant health.

However, when soil quality declines, it can lead to significant issues in the garden. The good news is that there are clear signs indicating that your soil needs attention, along with simple methods to revive it. Ahead, gardening experts share key indicators that your soil needs help, and offer straightforward techniques to address any underlying problems.

Mold Is Taking Over

In most cases, mold in soil isn't inherently harmful to plants; however, it can be a critical warning sign that your garden environment is unhealthy. Unhealthy mold in garden soil often appears as slimy, dense, or fuzzy mats that are black, green, or yellow, and they often emit a smell reminiscent of rotten eggs or sourness. Persistent mold issues are typically caused by overwatering, lack of sunlight, and inadequate airflow.

On the other hand, if you notice white, fuzzy surface mold, it is often harmless. Emily Scott, owner of Scott Farm in Maine, notes that when harmful mold is present, you might notice water pooling on the soil surface, and your plants may appear to be struggling. If mold issues are not addressed, root rot can occur and may kill your plants.

How to Fix It: To remove mold from the soil, remove the top 2 inches and replace them with fresh soil, says Scott. Another option she recommends is to sprinkle cinnamon or baking soda over the affected area. "Cinnamon and baking soda are natural remedies that can kill mold without harming your plant," she says. Mix 1 teaspoon of baking soda with 2.5 cups of water, then pour it onto the soil around the plant. To apply cinnamon, simply sprinkle a light layer over the surface of your soil.

The Color Looks Off

The color of soil can often indicate its health, says Eric Nieusma, an organic and regenerative farmer. "Putting a shovel into the ground and lifting out the top 6 inches can provide a visual indicator of its health," he explains. Healthy soil usually has a darker color, ranging from brown to dark brown or even black. On the other hand, if your soil appears light, bright-colored, or gray, it likely lacks vitality. "Soil that lacks life is deficient in essential microorganisms and worms, which are vital for creating healthy soil to nourish your plants," he says.

How to Fix It: To improve soil health, Nieusma advises adding compost, which immediately enriches the soil with life, and suggests covering it with a few inches of straw to lock in moisture. "Planting a cover crop can also help keep the soil shaded and moist," he says.

Nieusma emphasizes the importance of keeping the soil covered and planted year-round: “If soil is left uncovered and unplanted, its vitality decreases. Therefore, it is crucial to maintain soil coverage and cultivation in every season, from one crop to the next.”

Adding red wiggler worms to the soil is another way to significantly increase life, fertility, and structure thanks to their nutrient-packed castings. One pound of worms is recommended for 100 square feet, or one to five worms per square foot. You can find red wigglers online or at specialized worm farms.

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The Soil Feels Hard

Compacted soil is detrimental because it restricts root growth, reduces drainage, hampers oxygenation, and increases the risk of erosion. "Compacted soil does not yield when walked on and may also appear dry or cracked," says Nieusma. On the other hand, he explains that good garden soil is often pliable, easy to work with, and loose enough to be easily forked.

How to Fix It: To address compacted soil, Nieusma recommends using a broad fork to loosen it in a home garden-sized plot. “Although using a broad fork requires some strength, the tool does most of the work, making it manageable enough for children to help pull it back to loosen the soil," he explains.

If you find this task physically demanding or prefer an easier alternative, Nieusma suggests planting a cover crop, such as buckwheat, in the spring before your summer crops. "Buckwheat grows quickly and features roots that help loosen the soil, while also attracting pollinators in less than two months."

When it's time to plant, you can cover the cover crop with straw or compost, or you can turn the buckwheat into the soil a couple of weeks before planting your desired garden crops.

Water Just Sits There

Poor drainage occurs when water cannot pass through the soil, leading to prolonged soil saturation. This problem can arise from high clay content in the soil or from specific topographical features, especially in lower-elevation areas. If you're experiencing poor drainage, Scott notes that you might notice water pooling on the soil surface. After rainfall, the soil may retain standing water for hours or feel persistently soggy.

How to Fix It: To improve drainage, especially in soils with high clay content, it's beneficial to incorporate organic materials such as aged manure, compost, and leaf mold, which help separate clay particles and hard soil, allowing for proper drainage.

For potted plants, Scott advises ensuring that your garden pots have adequate drainage holes to prevent water from pooling at the top. Avoid overwatering and allow the soil to dry out before re-watering. This practice will help prevent root rot and mold growth in the soil. Additionally, ensure your plants get sufficient sunlight to help dry out any excess moisture.

Your Plants Aren’t Thriving

Soil that lacks essential nutrients can cause stress, and even death, to plants, says Nieusma. When soil quality is poor, plants struggle to thrive. This can occur due to overwatering and failing to replenish nutrients. A common sign is chlorosis, where leaves turn yellow due to nutrient deficiencies. Plants may also experience root rot, causing brown, mushy roots that can lead to poor health or death if left untreated. Even with enough water, affected plants may look wilted, indicating impaired nutrient and moisture absorption.

How to Fix It: Incorporating organic soil builders helps improve the soil's nutrient content. You can introduce beneficial microbes by adding 2 to 3 inches of compost or by using worm castings, which are rich in nitrogen, phosphorus, and potassium. For a quick boost, consider adding fish emulsion, bone meal, or kelp meal, as these ingredients enhance soil nutrient levels rather than simply feeding the plants.