Your soil plays an essential part in the health of your plants. They hold the nutrients that these plants need to grow. Testing your soil will help you ensure that your plants have the nutrients they need. If you discover that your soil lacks nitrogen, you can buy a fertilizer that plies it with the required nutrients. What's more, you no longer have to spend money on fertilizers you don't need. On top of the savings, you can also save the plants from being overly fertilized. Too much fertilizer will cause your plants to grow erratically and maybe even suffer from fertilizer burns. Testing your soil will also help you diagnose why your plants are wilting or dying. It might perhaps tell you that a deficiency in one of the essential nutrients is preventing your roses from blooming. pH: Acidic or Alkaline Soil Plants also don't like alkaline or too acidic soil. For the most part, most plants grow best in slightly acidic soil. A soil testing kit can tell you if you're working with soil that's too acidic or too alkaline. Similarly, some plants crave very acidic soil, while others like alkaline soil. Knowing your soil's pH levels will help you see if you need to amend the soil before planting.