Gardener’s Guide to Soil pH

If you’ve noticed your plants struggling to thrive, one possible culprit could be an imbalance in your soil pH. The pH level of your soil is essential for plant health and can directly affect the growth and vitality of everything in your garden. It may seem like a small detail, but soil pH plays a huge role in how well your plants can absorb nutrients and flourish. Whether you’re a seasoned gardener or just starting out, understanding soil pH can make all the difference. Here’s everything you need to know to keep your plants happy and healthy!

What is Soil pH?
Soil pH measures how acidic or alkaline the soil is. The “pH” stands for “potential hydrogen,” which refers to the concentration of hydrogen ions in the soil. The more hydrogen present, the lower the pH (acidic), and the less hydrogen, the higher the pH (alkaline). The pH scale ranges from 0 to 14, where 7 is neutral. Soils with a pH of 4-6.5 are acidic, while soils with a pH of 7.5-9 are alkaline. Most plants thrive in soil with a pH around 6.5. When pH levels fall below 5 or exceed 7, it becomes toxic for many plants.

Why is Soil pH Important to the Garden?
Soil pH directly impacts your plants’ ability to absorb nutrients. Plants require 14 of the 17 essential nutrients from the soil, and the pH level determines how available these nutrients are. Generally, slightly acidic soils (pH 6-7) provide the best environment for nutrient availability, allowing plants to grow and flourish. If the soil pH is out of balance, plants can struggle to access vital nutrients, even if they’re present in the soil.
Additionally, soil pH affects the beneficial microorganisms that help decompose organic matter. In highly acidic soil, these bacteria can’t function properly, causing nutrient buildup that plants can’t access.

Causes for Acidic or Alkaline Soil
Soil pH can vary depending on location. Dry, sandy areas tend to have more alkaline soils, while moist climates often result in more acidic soil due to rain washing away calcium and magnesium. The type of rock in your area also influences soil pH. For instance, areas with abundant lime will likely have more alkaline soil. Understanding your local soil composition helps you work with nature, not against it.

How to Test Your Soil’s pH
Testing your soil’s pH is the first step toward a healthier garden. A simple home testing kit can provide an accurate reading. Here’s how to use it:

1. Collect soil samples from various spots in your garden.
2. Mix the samples for an average result.
3. Follow the instructions provided with your test kit.

Knowing your soil’s pH makes it easier to adjust it if necessary.

How to Raise Soil pH
If your soil is too acidic, you can raise the pH by adding garden lime. Lime, a finely ground limestone, is available at Feeds’n Needs and helps neutralize acidity. Be cautious not to overapply, as too much lime can harm plants. To adjust the pH, apply lime in the fall, then rototill or turn the soil to ensure it mixes well with the ground.

How to Lower Soil pH
Lowering soil pH is often easier than raising it. If your soil is too alkaline, consider using raised garden beds filled with high-quality soil. If raised beds aren’t an option, sulfur can help lower soil pH. Mix the sulfur into the soil before planting. Additionally, materials like sawdust, peat moss, wood chips, and leaf mold can help reduce soil pH, especially when combined with sulfur.

Balancing Soil pH with Compost
Adding compost is a great way to stabilize your soil’s pH. The rich organic material in compost acts as a buffer, preventing drastic pH fluctuations that can stress your plants. You can make your own compost or purchase processed manure to enrich your soil.

Soil pH is a key factor in maintaining a healthy garden. By understanding and adjusting your soil’s pH, you can ensure your plants have access to the nutrients they need to thrive. Gardening is a journey, and getting to know the specific needs of your plants—like soil pH—will help you create a lush, vibrant outdoor space. Take the time to test and adjust your soil’s pH, and your plants will thank you with healthy growth and bountiful blooms!

Sources:
The Ultimate Gardener’s Guide to Soil pH | Blain’s Farm & Fleet Blog
Understanding Soil pH: Here’s What Every Gardener Needs to Know