How well do you understand your soil? It’s more than just dirt, and the more you learn about soil, the better you’ll be able to care for it to ensure a stunning landscape, healthy lawn and productive garden.

All About Soil

The four elements of soil are minerals, water, air and organic matter. Different combinations of the four elements create the four main categories of soil: sand, silt, clay and loam. Of course, we all want loam – that rich, vibrant soil thriving with beneficial bacteria and with a smooth but crumbly texture ideal for root growth. Unfortunately, true loam soils are rare, especially around homes where topsoil was removed and heavy machines compacted the remaining soil during construction or renovation. Most of us have clay soil, which has finer particles that compact easily into a dense mass. Clay soils also retain more water and can easily become too soggy or waterlogged for healthy plants. But just because your soil may be clay, it doesn’t have to stay that way!

Improving Soil

Improving soil is actually quite easy. All soils are improved by adding minerals and organic material that help balance out the overall components of the soil’s structure.

Before adding minerals, test the soil to determine its pH (acidity or alkalinity) and determine any mineral deficiencies. Lime decreases soil acidity, gypsum adds calcium and helps break up heavy clay and sulfur increases acidity. Other soil amendments to add to a clay soil include sand, cottonseed meal and peat moss, all of which will help improve the drainage and structure.

Organic matter refers to plant or animal materials decomposed into compost or “humus.” This residue comes from leaves and other plant materials, as well as certain animal wastes. Grass clippings, paper and certain types of decomposing food can also be ideal compost. The quality depends on the origin of the original biodegradable matter. Many people make their own compost using bins in which materials are mixed until they decompose. Others purchase finished compost. When compost is added to soil, it releases nutrients that are vital for healthy plants, and healthy bacteria and microbes will thrive in organically-rich soil.

The Magic of Mulch

Mulching is a simple way to add biodegradable materials to the soil. Evergreen needles, tree leaves, lawn clippings, chicken manure, etc., can be worked into the soil to decompose. This process improves the air spaces between the soil particles and rearranges the sand, silt and clay to produce optimum soil structure, improving the water retention and drainage balance and making nutrients available to plants.

When soil has proper structure and sufficient nutrients for healthy plants, optimum health has been achieved, and great soil will lead to great landscaping, turf and gardens. Congratulations and keep on growing!

Devised in 1909, the pH scale measures the concentration of hydrogen ions in a solution. The scale ranges from 0-14. Pure water is “neutral” and has a pH of 7, midway between 0 and 14. If a solution has a low concentration of hydrogen ions, the rating will be a higher number and is considered basic or alkaline. Likewise, a high concentration of hydrogen ions rates a lower number and is considered acidic.

What pH Means to Your Garden

There are four important reasons to monitor your soil’s pH level:

1. pH affects the availability of other nutrients in the soil. If the nutrients are not available because they are chemically bound to something else, plants can’t use that nutrient.
2. A high or low pH level in the soil allows some plant diseases to multiply more quickly, infecting an entire landscape or garden.
3. Most organisms living in the soil have pH preferences. For example, earthworms are not as plentiful in acidic soil.
4. Most plants have specific pH requirements to flourish. Those specific requirements are what the plants need to absorb nutrients more efficiently and resist pests more effectively.

Where Soil pH Occurs

Acidic soil generally occurs in heavy rainfall areas, as the rain will pull acidic compounds from the air and allow them to leach into the soil. Alkaline soil, then, is more common where there is less rain. However, this is just a generalization and neighbors across the street from each other may have a large pH difference. Reasons could include the origin of topsoil brought in, the tillage done in the area and prior occupants’ gardening habits. Even simple changes like how drain spouts are positioned or a watering schedule can impact pH.

The pH Your Plants Need

Most plants will grow well in the neutral zone of 6.5-7.0. However, some plants grow best in specific soil pH conditions. Interestingly, hydrangeas grow well in both slightly acidic and slightly alkaline soils, but the flowers will be blue in acidic soil or pink in alkaline soil. The colors and flavors of fruits and vegetables may also vary somewhat depending on the soil’s pH, even if the plant will thrive in a wider range.

This chart illustrates how slight pH changes can dramatically impact which plants will thrive in certain soils…

As you see, pH can influence your gardening choices. Knowing the pH of your soil is the first step towards understanding your soil and improving your garden. By knowing the pH, you may choose the best plants for your site. You may also decide to amend your soil to increase or decrease the pH to grow a wider variety of plants.

We offer several inexpensive and easy-to-use pH test kits. We also offer amendment advice and can help you choose the best plants for your soil’s condition. Stop in for pH help today and we’ll help you make the most of the natural acidity or alkalinity of your soil, or else help you turn that soil into just the pH you desire!