How to Test Your Garden Soil: A Step-by-Step Guide for Better Growing

Successful gardeners consider soil testing the most efficient, money-saving step toward better results. A test measures available nitrogen, phosphorus, and potassium, plus pH level—the acidity/alkalinity affecting nutrient uptake. pH ranges from 1.0 (acidic) to 14.0 (alkaline), with 7 neutral. Rainy regions tend toward acidity; desert areas toward alkalinity—both need amendment for optimal growth.

To raise low pH (acidic): add lime, dolomitic limestone, or wood ashes. To lower high pH (alkaline): add horticultural sulfur, composted oak leaves, or pine needles.

How to Conduct a Soil Test

1. Collect soil from six garden areas using a trowel or spoon.
2. In each area, dig 6 inches deep and take a sample—avoid roots, mulch, stones.
3. Mix all samples in a quart jar.
4. Place in a paper bag and send to a soil lab or county extension service.
5. Alternatively, use a garden center soil test kit for DIY analysis.